I did. I provided ample period documentation of George Rupp being known as George Rupp. There is not one single instance of George Rupp being referred to as "John." His own son Herman signed on to estate papers referencing him as George Rupp. In fact, there is not one single period document referring to him as "Johan George Rupp" or any variation of that name. That name is a product of the 19th century 'county history' books. It may be accurate, or it may not, but no serious researcher would reference one of those county history books as being product of fact. Conversely, I also provided ample documentation of an individual named Johannes Rupp, a son of George Rupp and brother of Herman Rupp, who was referenced frequently in primary documents by the anglicized version of his name Johannes = John. What is more of a stretch to believe?
It's funny how we all love to speculate and debate until incoming fire hits either a wallet or a ridiculously far-fetched manufactured theory. Suddenly, nothing short of a notarized statement of creation lodged in the box cavity will suffice.
The Sotheby's description - ESPECIALLY in light of the documentation regarding this family I've publicly provided - is nothing more than deliberate deception and reflects very poorly on both the auction house as well as the individual who authored the misleading description. It matters far beyond the concept of "to bid or not to bid" because (1) the long standing of Sotheby's company carries weight within the art world, and the casual individual will accept an associated description as being a testament of fact, and (2) because of the nature of the internet, the associated description will continue as an albatross around the 'wrist' of this rifle for years to come and further cloud and confuse the subject matter.