I have two junk boxes. I call them the greater junk box and the lesser junk box. Anything that looks interesting I put in the lesser junk box. I put the flat buttons and old costume jewelry, marbles, vintage dog tags, old pocket watches, etc., in the greater junk box. I think it is important to save things that look like they might be significant. When I first started detectin, I had much less of an idea of what all the types of Civil War relics looked like. About a year ago, I went through my lesser junk box, throwing out some items which after 15 years of diggin I could now I.D. as trash. I found a Civil War knapsack hook right there in the box! Only problem was I had no idea where in the world I had found it! Obviously I didn't find it with bullets, or else I would have suspected it might be Civil War. Now I know that there is a site there I would like to return to, but I don't know where it is. So if you start a junk box, try to write in your journal--and every detectorist should have one!--a line about each item you put in there, so that you'll know where you found it. I have a friend that threw away a few valuable Civil War relics because he thought they were trash. So if you think it might be valuable, save it until you I.D. it. I keep very little iron in my junk box because of the mess. Mainly only stirrups and items which I will go ahead and put through electrolysis to preserve them. These for me are not quite treasure, but cool enough to save anyhow.
Hope this helps,
Buckleboy