When I received my Octane 45, I was annoyed it already had two chips in the FDE coating which I chalked up to either the manufacturer or vendor handling. However, I thought either would be unlikely – SilencerCo would never ship something with nicks, and Silencer Shop probably didn't even remove it from the box. So what happened? Well, looks like the snap retainer that secures the molle strap to the case is metal on the INSIDE and is likely the culprit. The marks line up perfectly with the metal snap retainer inside.
If you have the same setup and carry the suppressor around in the factory case, you might want to put something between the suppressor and the snap retainer to protect the finish.