Where Does One Find True Value Of Coins

Buffalo nickels have this problem where the date is one of the highest points on the design - and near the edge. So it wears down massively.
It could be a partial date that you just can't read yet because you don't have enough experience. But even if it's indeed dateless, it's still worth 7-10 cents, not 5 as you said (also, people could try acid-dating these, which is considered damage but doesn't really bring the price down because there's nothing to bring it down to).
And yes, even in case it's really hecked up you could always try and use it as money (for 5 cents). So there's that as a minimum value

(Funny how nobody said any of these simple things before )