This seems like a pretty good idea... Using Amazon to help sell your old stuff!
The great thing is, they can also do fulfillment...
Having Amazon store your stuff (till it sells) also frees up your own storage space. It could make it easier to get rid of the clutter, and generate some cash at the same time...
You do have to ship your stuff to them, first.
Here's one guy who does this -
http://benguild.com/2013/10/20/store...f-with-amazon/
Best wishes,
Dien