I am considering selling a few of my Coach bags to some neighbors/acquaintances in an attempt to clear some clutter. When I purchased my bags between 2004 and 2006 I always filled out the registration card and mailed it in. Is there anything Coach can produce that I can share with potential customers to prove authenticity? Has anyone ever sold a Coach bag? Did you get much for it since it was used or rather 'pre-owned'? haha Many thanks.