If the purchaser/remitter still is holding on to the check, it certainly makes the answer easy. Get him/her to swap the check for one that's more current, and you've re-aged the transaction.
If the check has definitely not been paid, you may, if you are able, contact the remitter/purchaser and suggest that you may be able to refund the purchase price after running through the paperwork for a lost/destroyed/stolen cashier's check, and waiting the requisite number of days. Then pay the claim, and you're done.
Or you may let sleeping dogs lie and let the money go to the state.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8