Heya!
It's all about Street Magic, pg. 101, and some parts of the Digital Grimoire for this.
#1 I don't think a company would do this - there's very little benefit to it, aside perhaps from the Immunity to Normal Weapons to prevent wear and tear. But perhaps a Possession-tradition magician on staff likes to use the clones as their personal toys?
#2 Unless they're free spirits (an intriguing possibility that could be married up with the "personal playground" idea above) they can't have Masking, so it will be immediately apparent that they're possessed to anyone looking astrally (and getting at least one success on an Assensing roll, I guess)
#3 Have a look at the Escaped Clone Quality in Runner's Companion. Have the clones' minds become active and suddenly it's not destroying property, it's wetwork.