my chest freezers are still intact, but i read a little trick on here somewhere that if theyre empty, you can open th lid and let it come to room temo unplugged. then leave it open and turn i ton a little while. the frost on the interior of the walls should outline where the coils lie. pretty sure that you will find the cold coils on all the interior walls.
if your freezer has no hot side coils on the back, then i think they are generally on the outer side of the walls of the unit. not sure on that one a good way to outline them, but for your application, not sure it would be a good freezer to start with unless its got an external hot side coil.