The end of the story:
Rainflurry's suggestion cleanly removed the check without affecting 2022 data. Ironically, I had placed her file in a folder to report as Unclaimed Funds later this year, but she came in about a month ago with a different vehicle that needed repair. As I was preparing her Invoice after this repair, I created a Credit Memo in the amount of the lost check (attributed to Parts since that amount was for a part that we ended up not using but that she prepaid for), and offered to apply it to the current Invoice. She was completely unaware, and pleasantly surprised, and said that she lost that 2022 paperwork and didn't even remember seeing a check. So, problems solved all around. Thanks again to all who chimed in.
