Seems like there are potentially another pair of shoes in the bag, so if these are shoes from a dead person, there's only a 50% chance they were wearing them when they croaked.
The sensible thing to do at this point is, go find the shoes, stick your nose right in them, and take a big whiff.
If they smell like old man urine, then you know they were medical waste.
These were the shoes they kind of reminded me of:
