Can't you ask for seriel numbers from the seller (as well as identifying the retailer) and then check with Sonus to make sure they were sold thru their distribution chain? They are just one of several manufacturers who go this far to protect their dealers from grey market product.
Sonus Faber replacement parts
To all Sonus Faber owners who have purchased used, as Sonus Faber will not sell parts for speakers that were not purchased from an authorized dealer, how have you handled the need for part replacement and/or repair. I have been very interested in used Cremonas, but have been a little detered by the company's policy. Thanks in advance.