Yes I do believe this to be accurate. There is a complete absence of any canine impressions.No, nobody would do anything like that.
Much more likely is that whoever played the MPC got in a bar fight with the piano player and the piece accidentally fell off and got stuck between the pedals and stayed there unnoticed for 2 decades. And when the bar closed and they moved the piano, it scraped on the floor, hit a few nails and eventually fell off, just when the cleaning woman came with the big shop vac, so it got another few tumbles. There is really no other explanation!