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Let me tell you a rather uninteresting story.
Right away, I'll say that I've been very tired lately and haven't been sleeping well, so all my observations may be inaccurate to some extent.
Yesterday evening, my boss gave me thirty-one thousand five hundred rubles so that I could pay for delivery services the next day. It was 6 bills of 5,000 and 1,000 + 500. I put them on a shelf, and that's where I took them from the next morning. Both times, I didn't count them (sorry, I'm an idiot). When I arrived, I put them in the cash register and made a note in the logbook. Then I sat there, lost in thought, trying to figure out this terrible 1C program that I've never worked with before, and then a guy came in, delivered a package (one of several for that day) worth 18,500 rubles. I gave him the money, took the delivery, and signed the receipt. He said goodbye and left, and I went back to my work. About five minutes later, I suddenly felt uneasy and decided to count the money. I found the entry about how much I should have had before the replenishment, counted that and this, and suddenly realized that exactly ten thousand was missing. The thought that I might have received less initially crossed my mind, but I quickly dismissed it because I wrote "31500" in the logbook in the morning. I tried to find the missing bills, but I couldn't find them anywhere. Then I tried to replay the meeting with the delivery guy in my head, and here's what I remember: when I gave him 4 bills of 5,000, he already had 2 of the same in his hands. But here's the catch: I DON'T REMEMBER giving them to him at all; that memory is completely absent, it doesn't exist in my head. Moreover, all this money was in one place, and logically, I couldn't have given it to him separately. For this reason, I probably didn't pay attention to it at the time – well, maybe the guy just decided to get his 10,000 out for some reason (lol). He even asked me again, like, is everything correct? I said, yeah, I guess so. So, I quickly called my boss, told her what happened, and we started sorting it out. And here's the funny part, I didn't expect that: they said, oh yes, we gave you more money, we'll transfer it back to you. The guy himself said that he just took the money and didn't count it. WELL, YEAH (if I had given him 6 bills of 500, he wouldn't have counted those either?). Well, in general, I got lucky – it was resolved. I think he just didn't want to have any suspicion hanging over him in the future.
So, the main question is: how did those two 5,000 bills end up in his hands?
P.S. Personally, I didn't feel anger or resentment, and I didn't even start mentally cursing this idiot because I realized that in this situation, I was the absolute fool, and the fault was entirely mine, and he cleverly scammed me.