The client wants to track where the recycle trash goes. (Client could be store owners, franchisor/franchisee, the city where bin is located, the contracted recycling company or its competitor.)
Lots of problems beyond the deposit. What if the staff sees it being placed (cameras everywhere), then manage to fish it out? Or when the bin is dumped the tracker falls on the ground? A kid picks it up from the ground and takes it home? It gets stuck on a car tire (dont know how big/small it is) and is traced to someones home? (Even worse if that someone is an employee!) A squirrel or cat or other animal likes it and takes it home? It gets stuck forever in the bottom of the bin and the battery dies?
Will the shopper still get paid?
Too many unknowns about what the possibilities are compared with the possibility of not getting the deposit back (or not being paid).