Tactical gear trade is based in Guangzhou China, the stuff you've bought came from there. It's as close to official USMC kit as a hello kitty onesie, MARSOC have indeed been granted permission to use multicam in theatre, however there's absolutely no evidence to suggest they've actually worn it, 99% of the MARSOC photos kicking about have them wearing M81 woodland in order to blend in with the local forces they're mentoring.
As for multicam being an official US Army pattern, couldn't agree more, USMC and US Army are 2 very different beasts though. Not only that, if MARSOC were to wear multicam, they'd be wearing crye gen3 cut stuff, they're a JSOC/SOCOM unit and don't have the same supply lines as the regular USMC.