Or a Sawzall, torch, bolt cutters, grinder with cutting disc…?
What makes you think they took it off as carefully as you put it on? I’m sorry it happened to you, it sucks, and I hate thieves as much as anyone, but it would be pretty stupid for a shop to purposely damage their reputation for some stolen go-fast parts. I mean, how much could they get selling that stuff?
It would make sense if a dumb employee did it, but not anyone who owns/runs the shop, unless they are really freaking stupid.
Good luck, I hope you find out who did it, and I hope they get raped by bubba in prison.