The receipt is printed by a certified cash register. It even has a digital signature at the bottom.

Sure, the receipt will be thrown away, but the register keeps a record. So store owners can check in their employees and tax authorities can check on the owners.

The receipt is irrelevant except for ensuring that the purchase is in record.

It’s much harder to run a tax-free cash-only side business if everyone expects a receipt and the receipt printer has an audit trail.