How to get rid of counterfeit banknotes

Each of us may face such a situation that instead of a real one, a counterfeit banknote will fall into his hands. And okay, if it’s 5 or 10 rubles, which you can just give up on, you still can’t really buy anything for them, and even a fake of such dignity, subject to its good performance, in n-tsat years will cost no less than the original , at least many times more than its current price. But if this amount is much larger - 500, 1000 or, pah-pah, 5000 rubles. Of course, no one wants to lose that kind of money, so you need to find a way to get rid of the fake with minimal losses.
There are two thoughts:
1) put this piece of paper in a pack of real banknotes of the same denomination when paying for some expensive product, perhaps they will not notice;
2) another option is to try to pay her something through the terminal, in the hope that he will not be able to recognize the fake (I repeat, we are talking about a good quality fake, and not one that I can print on a printer).
What do you think about these two methods, friends? Maybe suggest some of your own?