How about making it so that maxed out wands/staves pop with 0 min and max charges instead of not appearing at all?

Right now it's easy to go through an area and find no wands because the supply is maxed out. This makes exploring for wands very difficult because it means you have to constantly re-explore every area just in case a wand that was previously maxed goes under max and is findable.

People have suggested placeholders before, but the problem with that was that nobody seemed to know of a sensible way to put placeholder items in. By simply setting the capacity to 0 you still have the same level of limitation, but it becomes possible to learn the location of wands that are maxed out.