An excellent caution. I think in CA at least they can tell just about every detail of the transaction from a collection of dashes printed on the ticket — time and date of sale, and which location, for sure. That’s some security against a simple “I said, you said” problem; if the store has surveillance and keeps it for a while, so much the better.
They tried doing that in Maryland but apparently the time stamp on the ticket wasn't in sync with the security camera at the place it was purchased from.