It is highly likely that it is Foxy's, but mangle still has it's endoskeleton, and foxy does too! Wait hold on MAYBE mangle's endoskeleton is just some old pieces, because that endoskeleton looks nothing like the ones in the 1st game. Rather, it must be from a toy animatronic. Therefore, maybe it IS mangle's endoskeleton... Or what if it really is Golden freddy's endoskeleton?
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Five nights at Freddy's: Theories and rumors
FanfictionSome theories and rumors I have heard about and come up with