You must produce those documents, because a subpoena is a court order. You could be held in contempt for not following the subpoena. You don't want to let that happen.
They are trying to find out whether you are holding property that is actually your husbands or is marital property in which case they could attach it as per the judgment.
Many times a person who is in debt will sign everything over to someone else so it looks as if they have nothing. The creditor, I'm sure, want to see if that happened here.
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