Short story: Hang onto them.
Long story: When I was at Carlisle this year, I had just bought my Coronet and was in full on parts hunting mode. I was surprised to see somewhat less used parts out there. It could be a one year occurrence, I'll see how it looks this year.
Our concern should be that when one screw or bolt or whatever is needed, we would have to go to repro companies and pay $10 for 1 bolt, or buy a minimum of a box of 50 (what do I do with the other 49, hand them out instead of trick or treat candy, give them as holiday or birthday gifts?)
This is no knock on the companies, I am very happy to see the great selection of repro parts available.
I had a bunch of parts displacing air in my basement for decades. I recently cataloged and listed them for sale. I was happily surprised that I was able to help people build their project affordably as well as make a few dollars on things that I thought were junk and was ready to throw out.
If the parts are small, I'll list them as a lot and let people pick from that.
Two examples:
When rebuilding my front end, I wanted to use the original style bolts with holes for cotter pins for the lower ball joints. 4 used original bolts and nuts in great shape $20
My car was missing a bracket for the auto floor shifter. I put out ads for months with no responses. I had to shell out $200 for the entire repro kit, all for a $20 bracket.
The short of this long story is, if you have the room and time to store, catalog and sell small items, do it for your fellow Moparians and the good of the "hobby".