I recently aquired a safety deposit box at my local bank and would like to use it to store some items. After doing a few searches regarding the boxes, I found several accounts of unauthorized access occurring from bank employees.I was wondering if anyone knows of or has ideas for a device that I could leave inside the box that would keep count on the number of times the box is opened.It would have to be non resetting and reliable enough to not give false counts.Ideally a low power device that could operate for  months or years without the need to change the battery that would record a time/date stamp of each time it was opened and closed.My only idea so far is some sort of light sensor tied to a data logger arduino setup with simple encryption but I am concerned the power consumption of an arduino may drain batteries too quickly even in sleep mode.Thoughts?