Kodak is completely out of the B&W silver paper business and has been for quite some time. Anything on the market now is at least a few years old, and close to being outdated if it isn't already. So no, I don't think it's Kodak paper. Fuji makes B&W papers, but they are not marketed widely in the US - if at all. Now that's a possibility, and Fuji is known to sell products for re-branding. Think of all the drugstore house brand color negative films that were Fuji in disguise.
Which of Ultrafine's papers are you using, Jim, and what are your opinions of it?