i have always turned down the key for the bar fridge.
just not worth it in the long run.
they check the drawer and the fridge daily.
anything that has been moved might trigger a charge on your account.
like the other poster said, they do a quick eye scan and see what is missing.
then charges occur.
they have come in and opened the fridge in my presence for a check on one visit.
when they opened the door, it seemed like the fridge was not cold but rather just kept the food from becoming room temperature.