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A QDRO has to be approved by the Court. So if you simply look into the court's records, you should see a copy of the QDRO, who filed it, when it was approved, etc. If you tell me what county the divorce was in, I can possibly tell you how to find this information.
The 401k is subject to the QDRO. He should still have whatever the QDRO does not take from the 401k, unless it was somehow attached for civil judgment or criminal restitution.
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