Not sure if you're interested in
ebay route, but this seller has the same shoes (new with box) in a size 38:
http://www.ebay.com/itm/NEW-NIB-201...hash=item488ad2c8da:m:mBjufCZklrO_1bftOFhlDnQ
The seller has very good ratings in the thousands, and they have many designer goods for sale, so you can be sure they only sell authentic. Price wise, you may be able to contact them personally and see if they'll take a best offer for the shoes.
Anyway, I know you mentioned department stores and/or boutiques, but just giving you a third option, in case the other two don't pan out. Best of luck!