Don't need a trail camera, I have caught them in the act. If I had a boomstick with me...
I actually know a few people this has happened too, and it seems to be a frequent issue on a lot of the lakes I fish. Go figure.
https://muskwraps.com/
These guys do these wraps, but I can make something more effective and cheaper myself. Just figured I would see if anyone has had issues, but I guess beavers dislike me more than most...