Son of a BITCH!
Last year I found a four inch CHICKEN BONE in the gut of a fluke!!! My son and I were laughing because we assumed that one of the boats around us must have been serving chicken for lunch!
It was a nice fluke, around 25". Must have been one that stole your bait! You might want to consider not using the bones next time.
at less than $2 a pound, maybe I found my next porgy and sea bass bait!