This idea actually came up because of a misunderstanding of some newbie cachers.
They actually took the whole container, and planned to relocate the container itself. This was discovered when some other people tried to find the cache. This resulted in a search to find out what happened.
It was eventually found, and this idea was born.
When someone finds a Wandering Cache, they can take it, if they like, and put it in a new location, then the new location is posted.
This could create temporary caches that just 'show up' in different areas, and races to find them before they are gone, or races to find them and move them.
The site isn't set up for this type of cache yet, but maybe it would work.
Maybe the cache container itself is like a geobug. You get a sticker or number that you put on the container, and it is recorded like a geobug, and can be tracked as it moves.