[ChuckMcM]

It isn't uncommon and it does raise generally ethical questions. I rescued a VAX 4000/600 and found that it still had the original drives in the main chassis (they aren't obviously in there and the system had an external drive chassis that had been destroyed.) The disks contained the OS and a shipping ledger (it came from a logistics company) of shipments that had come and gone from SFO during it's lifetime. Just from, to, short description of the contents and a tag of 'customs duty' or not.

Given that it was clear the company thought they had destroyed all of the data on the system I went ahead and deleted all of the non-system related files, leaving just the OS and layered products that they had originally installed.