I would be amazed if there haven't been...
Frankly, I'm kind hard pressed to get a grasp on the desirability of these things, other than the cachet of it being an issued military gun. Of course, you have absolutely zero idea if it was issued to a combat arms, combat support, or combat service support unit/individual; other than it being issued, you have no idea of its actual provinance/use.
To me, it's kind like the CMP 1911 release-other than to have a WWII era 1911, your're probably getting a mixmaster gun, with parts substitutions/replacements performed by unit or higher echelon organizations, with zero provinance, and a 1911 with inferior sights and steels/hardening. Personally, I prefer a Series 70 Repro (and I actually have both) if you actually intend to seriously shoot/carry the thing.
Unless SIG and/or their distributors are offering these things at significantly discounted prices (because, hey, it's a used {and used apparently to a wide spectrum of use/wear possibilities}, my interest level is low. And other than providing the additional RSA for use with standard pressure ammunition, SIG isn't specifying that they've performed any examination or refurbishment-or if so, what specifically it entailed. And I curious what warranty is provided...
Best, Jon