I'm not aware of any SA set produced by SP that utilizes their glossy finish. All the ones you see out there are their semi-matte finish (I think it should be called semi-gloss, but whatever). If they appear glossy it is because they've been worn down a bit and become glossy over time (ABS plastic is like that). Maxkeys and SP use the same finish molds, so their SA keycaps look and feel pretty much identical.
Note: SP has made SA keycaps in the past using their matte molds, but they are quite rare (Commando is the only set that immediately comes to mind).