My first thought was that you were in Rose Bay police station which is believed .
Panic/Duress/Holdup buttons are often designed to positively indicate whether they have been depressed. Often they lock closed once pressed and require a handcuff key to unlock them, the point being that when the Police arrive at a false alarm and get upset, the owner can't claim that nobody pressed the button when there is a mechanical indication that it was pressed.
Yours are also a locking/latching type resembling the proverbial "Big Red Button". I have never heard of a button failing in such a way as to effectively press itself and even if that could happen, the chance of it happening to both of them is even more unlikely.
There are certainly wiring or electronic reasons for a false alarm however in that you've suggested the buttons were found to be actually pushed in, I would suggest you get the detectives onto the problem, not the techs. You should have dates/times etc. of the activations and be able to narrow it down. I know you said there was nobody there, but may be a cleaner etc.
Failing that, who ya gonna call?
(Me)
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