Does anyone other than Ed know that Rye's body was ground up? We never actually saw what he did with the "ground meat", but I assume he was able to throw it out as "spoiled" or something. As others have noted, the belt buckle that Simone threw into the Rye's burial plot had been found by Hanzee in Ed and Peggy's fireplace a few episodes back.
I also thought it was a smirk of self-satisfaction, but I wondered if it was because she was sending the cops on a wild goose chase.