so the one move that catches all three is basically make them tie the paper to the specific jar? relabel, recycled CoA and the colour thing all fall apart once you ask which batch is which?

@MayaW pretty much. colour is a separate eye-roll but yeah, batch-to-paper matching kills the two CoA ones. cheapest check there is and the one they bet you wont do

the real-doc-wrong-jar thing should honestly be somewhere new people see it first. not obvious at all till someone spells it out