Yes imo repop signs, globes, cans and ad glass should be dated.

Just so I'm clear does this also mean every can that has new lids put in it needs to have RE-LIDDED ON XX-XX-XXXX stamped into the top and/or bottom? Especially if it was filled with oil during the lidding process...is this done to deceive a future buyer into thinking it is a more valuable NOS can?