nah, I don't think you should worry - at least one CAME out - I remember my cat, Miles - ate a WHOLE plastic mouse (including furries, cloth eyes and tail) with a bell inside - I freaked out that it'd block his bowel movements - took him to vet next day, asked what to do next. my YEARS vet... chuckled ( ) and said "it's very common and they USUALLY come out, RARE to have surgery to remove it out"-- I also think you shouldn't really worry because if it were this glass that cutted an organ inside your cat, the hole may heal itself, and/or TAKES years to show symptoms finally. you don't have time worrying for that

can you imagine every feral eats sticks, something metals, steels, glasses, stones, pebbles, can poppers, etc etc and we still take these survivers in!