Yosef Karo

“ Rema: See above in #36 regarding the custom whenever we are unable to ascribe it to something after it's been shechted. Even though it's treifot that can be checked, if they didn't check it or they're unable to check it, behold it's like safek treifah and we forbid it. ”

“ And all that we said that if it's removed it's treif, it's the same rule if it's created missing it, but there are some who rule this kosher.
(o.o.) (And if it's a big loss it's you can rely on those who rule it kosher) . 3 Any body part that invalidates it if it's punctured or missing or removed, if it's decomposed it invalidates it too.
Rema: But for us who are not expert - whenever the flesh is altered to a fault, it should be considered as a puncture there (H"M and Mord') . ”