Swim -
You got it right on the picture forum.
The 858SG is easily distinguishable from the other Fuente sun grown products by the 858 embossed on the cello. It should also be in a wooden box like the other 858's, have cedar, and of course the black foot.
I would be very surprised if you find them, although they were sent to the same stores that got the Rosadas.
Even if they did go to the store, they could already be gone, or, he may be holding them back until the holidays.
Good luck.