In a store, if you were paying cash for something and the store clerk were charging you sales tax, would you insist on getting a receipt, or would it not matter to you?

I went to a thrift shop before (earlier today) and bought two items. One item was $25 and one item was $10. I asked the store owner if she could do better on the two. She said she could do $30 for both, which is a $5 savings. When I paid, she said she would have to charge me sales tax, and since she didn’t have a register, she said “just make it $32 with the tax.” I paid her $32. After, I was thinking that since it’s a cash transaction, and she charged tax, I should have asked for a receipt. If she did not give me a receipt, she could just pocket the money and not pay the tax on it (in other words, my tax money may have gone right into her pocket, and my discount was not as big as it was intended to be).

Would you have asked for a receipt or would it not matter to you, in the instance where you were charged sales tax on a cash sale?