Active Missile Found in Czech Server Room

Backstory

I am doing some air-condition maintenance in an small business office building. No one was in that server room for more than 2 months since the last IT guy left and apparently took the keys with him. AC gave up, found out there are no spare keys, had to break in and found this. Farewell present from a former employee maybe?

Update

Calling owner of business.

Update 2

Owner has no idea what it is or how it got there, there is a military warehouse few kilometers away with defunct BVPs nad V3Ss. Calling cops.

Update 3: 14:30 CET

Bomb squad is on the way, we are ordered to evacuate the building and leave the premises. Will update when they'll get here.

Update 4: 14:50 CET

Bomb Squad in the building: Police want to confiscate our phones and stuff for pics maybe? Hope I am not in trouble for posting that pic.

Update 5: 15:03 CET

Mobile phone confiscated, updating from notebook. We have been escorted maybe 2 kilometers away to some parking lot with police escort. We have to wait for a police interrogation. They are really not cool about it.

Update 6: 15:16 CET

Just heard from police radio. It is a freaking active bomb, live explosive, not inert or whatever is the correct fucking wording for it in english.

Update 7: 15:32 CET

Bomb squad will try to remove the device if it is not wired and transport it to some safer place, we are on our way to a police station. Some black vans with no registration plates on the scene, few military cars. It looks like a complete military lockdown. Crazy stuff...

Update 8: 17:33 CET

Got my phone back, I have been through a police investigation about what I was doing in that place and so on. We have been thanked for acting like we did. It was an active anti tank missile, bomb squad was not authorized to manipulate with it, military bomb squad had to be called, it is being transported to a nearby military area where they are going to detonate it. I could get any more info about it being wired or how did it even get there but hopefully will be able to get some more info from an owner of that factory, will keep you updated. There is an strict embargo about it we can't talk to press or anybody so I hope this will be ok since I did not mention anything too specific.

Reddit link