I assume that you were listed as a creditor on the original bankruptcy. If so, then in order to reopen the bankruptcy and file an adversary complaint, you would need evidence that could not have been known by use of the tools of discovery at the time that the original discharge order was entered.
This means that even if you did not have the evidence in your possession, if you could have subpoenaed it from the DOJ at the time of the bankruptcy, and you failed to do so, then the court is likely to deny your complaint as res judicata (already decided).
If the evidence was unavailable by any means due to the debtor's willful concealment, and only now has become available, then that would give you grounds to pursue the debtor.
Hope this helps.
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