Check SARCO or Numrich pages. That will give a ball park. But your question is too generic to be able to give an accuracte assessment. Kind of like asking "I have a car, what's it worth?"
As stated, if the parts are WWII era parts, well they won't have the value of WWI parts. I just purchased a bunch of incomplete 03 bolts from SOG for about $12.00 apiece. And they were new. I have paid $6.00 for new stripped square lugged A3 bolts. When the supplies dry up, a complete bolt might bring $20.00 to $30.00, maybe more. I would pay more for a pre War Double heat treat or a NS in new condition.