I was told they keep them for about a year, as I recall, due to mold shrinkage and possible changes to your canal...
Not sure about the sending yours in thing, they could scan them I suppose, but like was said, easy as a call or email.
I emailed them last night and got a quick response last night. They told me nothing ships till the end of November. More info to come in a week or so.
Edited by bearFNF - 10/25/13 at 3:37pm