<human>: Can you provide a brief rundown of the text in within 3 sentences?

So I work as security for a place (which I will not disclose). This client recently swapped from key locks to keycards and security has one card to all the rooms just in case. The client also switched owners and it is a new company of which we do not have a contract with per se.

I was going about my night and used said keycard twice. I placed the keycard in thd center console (where it normally stays, out of sight) of the patrol vehicle. I went to do lock checks on the main buildings and may have left the vehicle unlocked on the driver door. Been here for a few months and never an incident, but typically I do lock the vehicle.

Fast forward to X o'clock a.m. when I am to be off shift. I go to return the keycard and notice it missing. I search high and low, pulling everything apart and it is nowhere to be found. I check all my pockets and there is nothing. I begin to panic.

I tell management I might have accidentally locked it in a room. And we check both rooms I used it on. Nothing turns up. I take my personal vehicle and search the entire patrol route, everywhere I went that night. Still nothing. 

I end up telling management that someone may have taken it. They've informed me that this particular keycard works even if deactivated, and until someone goes around to over 800 rooms manually with a card to cancel the access there cannot even be a replacement and the other one will continue to work. They deploy people to comb the grounds for it in hopes it turns up. So some thief is roaming around with the master key. Great. I offered to do the lock cancels on my own free time...they decline and thank me for my efforts and send me home. I may have also gotten my supervisor in trouble because it turns out it was given to us with a belt clip which I haven't ever seen before. At minimum I am getting yelled at and a write up. I have a gut feeling that I will not have a job when I return to work tonight. Might have lost the contract for the lot of us.
<bot>: basically let the MASTER KEY get taken in the middle of company buyouts and it is a huge fiasco replacing it. Maybe fired. Maybe gotten my boss in trouble. Maybe lost the contract for us.