Hmm I thought he said it was cash… Then he does say check. If that were the case I’d (if I were the company) call the lady to verify that a check was given and to have her ask her bank if it was cashed yet, I would then simply ask if she could write another
Dock the person (in this case pete) the 75 bucks, and if it checks out re-imburst him once the check is in hand.
Or keep both and teach a valuable life lesson 
rofl:rofl