I believe...
Mannequins will be to store gear sets.
Said storage boxes will be for the seasonal event junk.

I think this will be fine if you get a lot of mannequins to put gear sets on.

The problem i see with 'unlimited storage' is it can encourage players to 'packrat' more, and could lead to a drop in the servers economy, due to not enough stuff being sale because they can store stuff forever.