Just went and double checked those soft baits, 1 of them had a partial hook in it, and all of them had hook tear out to a greater or lesser degree. Not sure whether the trout stole them off the line, or if they were discarded because they were worn out and it picked them up that way.
They are in various states of decomposition though, so it looks like they accumulated over a period of time.
Going to cook it for dinner tonight. Will report back on whether it tasted like car tires.