Can you give it back? If I got passed under yellow, and the guy tried to give it back, I'd be quite reluctant to take it. Workers didn't see his pass but do see mine and now I'm guilty of PUY.
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At the '05 Runoffs, I was involved in such a situation.

There was a full-course yellow, but I had a head of steam and was concentrating on making a pass at that moment, and realized that we were under yellow just I was completing the pass. So, I waved the other driver by me.

The stewards did not see my pass, but they found the other guy guilty of passing under yellow. In impound, I overheard the stewards chastising him, so I walked over and explained that he was just taking his position back, and I was the one who was really guilty. They didn't have my car number on their list, but they were not amused, and chastised me for giving the position back.

Frankly, I think I did the right thing. In the end, neither one of us was penalized.