The shotgun's pieces are very clearly an amalgamation of other weapon parts. Magazine, grip, fore-end, sight, upper rail, etc. have all been blatantly taken from a variety of weapons and pieced together as something new. I can't see all of the details of other assets from work, but that one is a pretty easy sell.
Even in the best case scenario (for them), Trek's integrity will be in question from here on out.
If the asset theft is relegated to only 1 in-game model, then the whole thing could be chalked up to a single employee making a very poor decision on behalf of the company (something like this would probably be explicitly prohibited in one's employment contract). They'd get to the source, correct the wrongdoing, and apologize to Activision and their customers, hopefully regaining consumer confidence in the long term.
If the case is severe, then they can't be trusted at all and are undeserving of further consumer interest and money. They'll reap what they have sown.