What Kind Of Alarm Contact For This Key Box?

We tried putting a wireless door contact on it, and it would show open sometimes. Not sure if it was the size of the contact and the way it made contact with the door or all the metal that was creating a problem. Any suggestions on how to put a contact on this? We already ran a wire, just need to find the right contact. Would a hardwired door contact work better or something like a tamper/plunger switch work better?

The key box is on a 2nd partition so even when the shop is open, only the shop manager can get to the keys.

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