I'm struggling for awhile, must be something very simple...

I'm using metadata api deploy to create a new custom object without success and no errors returned. 

My guess would be something with zip package, can someone point me what i'm doing wrong ?

Zip file package contains the following files/folders:
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* unpackaged\package.xml
* unpackaged\objects\DummyObject__c.object
    
package.xml content:
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    <?xml version="1.0" encoding="UTF-8"?>
    <Package xmlns="http://soap.sforce.com/2006/04/metadata">
        <types>
            <members>DummyObject__c</members>
            <name>CustomObject</name>
        </types>
        <version>28.0</version>
    </Package>
    
DummyObject__c.object content:
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    <?xml version="1.0" encoding="UTF-8"?>
    <CustomObject xmlns="http://soap.sforce.com/2006/04/metadata">
        <actionOverrides>
            <actionName>Accept</actionName>
            <type>Default</type>
        </actionOverrides>
        <actionOverrides>
            <actionName>CancelEdit</actionName>
            <type>Default</type>
        </actionOverrides>
        <actionOverrides>
            <actionName>Clone</actionName>
            <type>Default</type>
        </actionOverrides>
        <actionOverrides>
            <actionName>Delete</actionName>
            <type>Default</type>
        </actionOverrides>
        <actionOverrides>
            <actionName>Edit</actionName>
            <type>Default</type>
        </actionOverrides>
        <actionOverrides>
            <actionName>Follow</actionName>
            <type>Default</type>
        </actionOverrides>
        <actionOverrides>
            <actionName>List</actionName>
            <type>Default</type>
        </actionOverrides>
        <actionOverrides>
            <actionName>New</actionName>
            <type>Default</type>
        </actionOverrides>
        <actionOverrides>
            <actionName>SaveEdit</actionName>
            <type>Default</type>
        </actionOverrides>
        <actionOverrides>
            <actionName>Tab</actionName>
            <type>Default</type>
        </actionOverrides>
        <actionOverrides>
            <actionName>View</actionName>
            <type>Default</type>
        </actionOverrides>
        <compactLayoutAssignment>SYSTEM</compactLayoutAssignment>
        <deploymentStatus>Deployed</deploymentStatus>
        <enableActivities>false</enableActivities>
        <enableFeeds>false</enableFeeds>
        <enableHistory>false</enableHistory>
        <enableReports>false</enableReports>
        <fields>
            <fullName>UID__c</fullName>
            <caseSensitive>false</caseSensitive>
            <externalId>true</externalId>
            <label>UID</label>
            <length>38</length>
            <required>true</required>
            <trackTrending>false</trackTrending>
            <type>Text</type>
            <unique>true</unique>
        </fields>
        <label>Dummy Object 1</label>
        <nameField>
            <label>Dummy Object Name</label>
            <type>Text</type>
        </nameField>
        <pluralLabel>Dummy Objects</pluralLabel>
        <searchLayouts/>
        <sharingModel>ReadWrite</sharingModel>
    </CustomObject>
    
    These are the webservices messages exchanged:
    
deploy 
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    <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <soap:Header>
        <SessionHeader xmlns="http://soap.sforce.com/2006/04/metadata">
          <sessionId>*** sessionId ***</sessionId>
        </SessionHeader>
      </soap:Header>
      <soap:Body>
        <deploy xmlns="http://soap.sforce.com/2006/04/metadata">
          <ZipFile>*** ZipContent ***</ZipFile>
          <DeployOptions>
            <allowMissingFiles>false</allowMissingFiles>
            <autoUpdatePackage>false</autoUpdatePackage>
            <checkOnly>false</checkOnly>
            <ignoreWarnings>false</ignoreWarnings>
            <performRetrieve>false</performRetrieve>
            <purgeOnDelete>false</purgeOnDelete>
            <rollbackOnError>true</rollbackOnError>
            <runAllTests>false</runAllTests>
            <singlePackage>true</singlePackage>
          </DeployOptions>
        </deploy>
      </soap:Body>
    </soap:Envelope>
    
deployResponse 
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    <?xml version="1.0" encoding="UTF-8"?>
    <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns="http://soap.sforce.com/2006/04/metadata">
      <soapenv:Body>
        <deployResponse>
          <result>
            <done>false</done>
            <id>09SO0000000ew0sMAA</id>
            <state>Queued</state>
          </result>
        </deployResponse>
      </soapenv:Body>
    </soapenv:Envelope>
    
checkStatus 
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    <?xml version="1.0" encoding="utf-8"?>
    <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <soap:Header>
        <SessionHeader xmlns="http://soap.sforce.com/2006/04/metadata">
          <sessionId>*** sessionId ***</sessionId>
        </SessionHeader>
      </soap:Header>
      <soap:Body>
        <checkStatus xmlns="http://soap.sforce.com/2006/04/metadata">
          <asyncProcessId>09SO0000000ew0sMAA</asyncProcessId>
        </checkStatus>
      </soap:Body>
    </soap:Envelope>
    
checkStatusResponse 
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    <?xml version="1.0" encoding="UTF-8"?>
    <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns="http://soap.sforce.com/2006/04/metadata">
      <soapenv:Body>
        <checkStatusResponse>
          <result>
            <done>true</done>
            <id>09SO0000000ew0YMAQ</id>
            <numberComponentErrors>0</numberComponentErrors>
            <numberComponentsDeployed>0</numberComponentsDeployed>
            <numberComponentsTotal>0</numberComponentsTotal>
            <numberTestErrors>0</numberTestErrors>
            <numberTestsCompleted>0</numberTestsCompleted>
            <numberTestsTotal>0</numberTestsTotal>
            <state>Completed</state>
            <stateDetailLastModifiedDate>2013-12-17T21:23:20.000Z</stateDetailLastModifiedDate>
          </result>
        </checkStatusResponse>
      </soapenv:Body>
    </soapenv:Envelope>
    
    
No errors, nothing deployed, what i'm doing wrong ?    

Workbench
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Following Daniel Ballinger suggestion to use the workbench, more info returned:

![enter image description here][1]

It seems something is wrong with the package no ? but what ?
  [1]: https://i.sstatic.net/kyltl.png