So I called the workplace and got the only supervisory-type person in the bullpen, who was able to look at the time-sheets and tell me that actually, the time-sheet was clean except for one person who'd worked that day already having signed out, so evidently I did that. I just didn't copy the evening hours sheet, and that's something today's check-in person can do without my help, and they may or may not notice that it hadn't been done earlier. It's a courtesy and a convenience, but not vital.
I feel a lot better.