That eventually evolved into my stuffing them all in my car’s glove box until it too overflowed and I tossed every last one.
Then, as I got older-and experienced a few times when I badly wanted to return something but couldn’t-I began letting my receipts float freely in my purse. When I was really young, I generally just threw them away the moment I walked out of the store. I’ve had many systems for dealing with receipts over the years.