If they are lead then they are normally closer to pure lead. Most people will melt them separate. I throw a handfull into a full pot. My pot holds 100 pounds of lead so the stick-ons don't change the melt much. I have been saving them lately because I have aquired a bunch of pure lead and plan on melting them with that. If they aren't lead then you can scoop them out with the clips.
I don't ever remember being absent minded.