Personally (since you asked) I would not shoot it - in fact I would not have bought it (traded for it) in the 1st place (unless I wanted a wallhanger)
The problem is "you just don't know"
You assume that the rifle is 'fine' and that it lost its bolt sometime and someone just put a 'new' bolt in. Was the bolt correctly fitted ? (fitted as in adjusted to fit properly, not just shoved in the bolt-raceway) - you just don't know.