There is a related scam here. If you use a chain that has a cloth outer you need to carefully check for cuts and any offing feeling links.
The scam is usually done when the chain is left attached to street furniture so that the link is cut, rejoined by cable tie and then covered by the cloth. When you park your bike and secure it, the thief just cuts the cable tie.
The related bit is the knife used to cut the cover straps and then removing the cover to reveal the bike type etc