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If you know he is working for the post office, have your attorney subpoena his employee record of some sort or paystubs from the post office and present it in court. This is a fairly common strategy that nonpaying fathers do. Also, any pictures of the truck would be helpful.
There are websites like that but I am not sure how reliable they are. Your better bet would be to contact your state's workforce commission. Employers are supposed to report info about employees to them.
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