Ewwwwwe.  So you're Andy Mays of Southwest Harbor, a fisherman, and you're helping Darling Marine Center, the University of Maine's research facility in Walpole, do some reasearch by saving a whole bunch of scallop guts.  You put the formaldehyde soaked innards into a car with University of Maine plates then go inside

Inside, the person you believe owns the car isn't there and you go back out to find the car is gone.  Oh bother.  Now some stranger is driving around with 6 months worth of nasty work in their car and, when they realize it's a bucket of guts, will probably just chuck it!

If the person who owns the car hasn't noticed yet, before long, they will smell something fishy.