Many if not most of the artifacts were common to all the missions. They nearly all left behind Portable Life Support Systems, which kept astronauts alive inside their spacesuits. Those PLSS’s also had batteries and remote controls and valves associated with them, which all count as separate items in the NASA catalogue. Then there are the cameras, both still and video, used to transmit images back to Earth. And as any upscale camera owner knows, there are many lenses, cables, mounts, triggers, and handles to go along with each device.