Holy shit you’re dense. This isn’t Dark Souls and that’s a video game, not a table-top, theatre of the mind, RPG.

If you can learn that the crate, which is indistinguishable from any other crate, has no reason to be where it is then you can perform further tests to expose whether or not it is a mimic. It will look exactly like a crate the whole time and that’s fine. It’s not a paradox, you’re just not very intelligent.

You’re fifty-two cards short of a deck and making it everyone else’s problem.