Danish TV just did the same to mass thieves here, put GPS trackers in some instant coffee jars ( seem to be popular among thieves and so users too )
So they sat in the store watching a guy steal a whole shopping cart ( the entire display several cases of instant coffee ) they then called the police that said " well thats too bad, but we don't have time or manpower to deal with such things"
They then the day after tracked the coffee to several little "immigrant" kiosks, where the owner of course denied knowledge of anything.
I think it is genius, and should be used more often, though it will need a change of Danish law as the police are not allowed to use things like bait cars and so on here, which are of course embarrassing if you ask me.
Funny thing those little kiosks and pizza joints they can exist on streets where all other shops close, even same kind of shops
where my friend use to live you could spit from one pizza baker to the other, there was like 6 of then within 1 stone throw.
15 years ago there was 1 pizza baker there, and he had to close up shop as there was too little sales, but these guys ??????
I have always wondered how that can be.