I recently inherited a cap and ball .44 and some casting stuff from my father. A lot of the stuff looks to be lightly used if used at all. I decided to take the screws out of the molds and apply a little anti-seize to them. The apparently unused 2 cavity conical mold had a "righty-loosey" screw and was easy to take apart and put on a bit of anti-seize. The .454 single cavity round ball had a "lefty-loosey" screw and was TIGHT. I almost thought that I was going to strip out the head it was so hard in coming out. I did put on some anti-seize and put it back in, was very hard to get back in too. Here are a few pics of the mold, not sure if that will help at all to tell if it has been used or not, looks really clean.
Thanks for looking and adding any input!