Originally Posted by
anacapamalibu
Back in the $50/single entry days, I had the airlines say..OK I give up ,which
China visa is current? Then they said, you got so many visas, why don't you just move there. Well I can't..they won't allow that for laowais.

I never had any confusion with used single-entry visas--they mark them off when they're used and the airline people aren't mislead.
Now, with multi-entry common they've probably gotten used to old visas that aren't marked off and it hasn't been an issue.