Sure, happens now and then.

I work at an ISP / housing / colocation company, and occasionally hardware goes missing (nobody knows where it is anymore, it's not where it's supposed to be). Maybe some of them are broken, some might be stolen, but I'm fairly sure others are still running, not serving any purpose.

And from time to time we stumble over some virtual machine (or even phyiscal server) where nobody knows anymore what it's supposed to do; the standard procedure seems to be firewall it off, wait for a few weeks or months to see if anybody complains, and if not, shut it down, maybe archive it.