They took everything but one odd thing

The robbers took everything I had. Everything my couch, TV, and even the trash but they didn't take my my half eaten subway sandwich . out of all the things they took they didn't take my sandwich. IF they were going to take the trash then why not the sandwich. They just left it in the middle of my living room. I am just really shocked and I don't know what to do. "They would've eaten it if they wanted , I brushed my teeth this morning .' I thought to myself jokingly . I told the police about it but the said it was worthless. They sprayed this stuff to show fingerprints on every inch of the house but my half eaten sandwich. Like the robbers would have had to touch it to put it in the floor DUH!