This reminds me of "ring & run". Some of the kids in our neighborhood used to put dog poo in a paper bag, light it on fire, leave it by the door, ring the doorbell, & RUN!!!!!
While I never participated myself, it was fun to hear the different stories.
Anyway, just take some of your pets remains and smear it on the most likely place where the "sign nappers" are going to grab it. Yuuuccchhhhhkkkkk!