I was thinking that a security guard who monitored the building might notice the one person who was at their desk over the weekend, or in the middle of the nigh

I was thinking that a security guard who monitored the building might notice the one person who was at their desk over the weekend, or in the middle of the night. The most likely explanation is that they are completely checked out of their job and didn't really perform it to the spirit or even the letter of their responsibility, but I want to give them the benefit of the doubt.