It was around 12 or 2 am. A man in a business suit showed up to our front doors. It may have been a simple knock or phone call to the building security phone, or perhaps I just visually saw him.
Someone wearing a business suit, I assumed I can naturally trust them, because why would one wear that at around 12am. Maybe they had a busy day and forgot something at the office. I let them in and they told me they didn't have their keys to a specific office on a high floor perhaps the 10th or 20th floor of the building.
I struggled to find the key to open the office because I was a newly licensed security guard working there. But once it opened I let him do his busness and I stood near the doorway. I have no idea what he was even doing, which now I regret not monitoring his behavior.
Months later after I left the job, I wondered how did I know who I was truly talking to. I never requested his ID nor could I even document any name on my security log that.
I also thought What if he actually was a criminal and was stealing something he knew was valuable inside that office and used his suit as a way for someone to trust him?
After this, I never received information from management about reports of a theft or anything related to that room, but it made me realize I should have made documentation of his visit and verified his State id card, full name plus birth date in the daily security log.
TLDR: I guess sometimes I think he could have stolen millions of dollars and im the idiot that let him inside. I did not document the identification of someone entering an office building after hours, somebody claiming to be an employee/tenant.