I'm going to be bringing some beer that I picked up in Europe into the US in my checked baggage. I am planning right now on about 20 bottles (roughly 10 liters) of beer and 2-3 bottles of wine. Citizenship is US.

1. Has anybody had any negative experiences with bringing what may appear to be a large quantity of beer into the US?

2. Is it normal for customs to require some kind of proof of how much you paid? This beer is not special and cost no more than 1 USD per bottle (but would be much more expensive if purchased in the states if you could even find these local brands). I don't have receipts.

Thanks