Faint beeping inside fuse compartment

Odd thing I noticed when cleaning my car, the cover of the fuse compartment was off and the doors were open but the car was off. I heard a very faint beeping in threes coming from somewhere inside where the fuses are. It was super faint and with the cover on you couldn’t hear it. beep beep beep…pause…beep beep beep.

Any thoughts? Maybe something to do with the alarm?

It did stop after a while, I just noticed.
 
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