Tamper Evident Counter Espionage Trap
by Hasbinbad
A small piece of tin foil will bend easily and not return to it's unbent shape.
You can draw a template of a complex hard to duplicate shape, and cut it out of the foil VERY CAREFULLY. The more unbent the foil is, the better tamper-evident trap you can set.
Then tape the foil in such a way that it will bend when the door opens.
Even if the thief knows about the trap, when they go to try and replicate the foil, it will be difficult, and you will have the exact template shape to tell you whether or not it's a fake.
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