You're given too much change, what do you do?

I've had two incidents occur, one in which I purchased a $200 black powder derringer, but noticed that I was only charged $20. I stayed in the store and raised the problem, so that I'd be charged appropriately.

Then today when I ordered a 750 bottle of vodka and went to pick it up. But when I looked into the bag with my name on it, there was a 1.75 liter bottle of vodka in there. I mentioned that I only paid for 750 ml, and it was switched out.

Some people in this case would've just left, but I was raised to be honest and not capitalize off of the mistakes of others. I view it as immoral and outright thievery if I'd done anything other than what I did in both of those cases.

What would you have done?
Youre given too much change, what do you do?
Just leave
Fix the problem
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You're given too much change, what do you do?
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