The face of them looks sort of like the Sport Design wheels that came on my 99 Boxster. (Link to the wheel below.) But they are different enough for a number of reasons to say that they aren't the original Sport Design wheels that were available for Boxster and 996. I don't think they are original Porsche wheels. The offset looks pretty off as well. For reference, I think my Sport Designs are 7.5x18, offset 50 and 9x18, offset 52. If it helps, I can check when I get home (wheels are sitting in the garage since my 99 Boxster turned into a BSR). The Sport Design wheels are among my favorite on a Boxster.
Sport Design