The only thing I know is that they've been available from that same seller for well over a year now. There's red striped ones, too. Did those see retail release? I remember hearing talk of bootleg troopers (as opposed to factory extras or whatever), but the seller's other stuff looks like actual production items.
I've never bought anything from that seller.
Hey, just wanted to thank you again for this information. I just bought my third set of these...first batch yellow striped, second batch red striped, and the latest batch green striped. They are definitely unique from any previous figures ever released in this line in any form. (Although the yellow guys are very close to the 212th clones they out out a few years back)
The main difference, which is apparent right away, is the base plastic is grey, not white. It's hard to tell the difference from the auction photos, but very noticeable in person. These must have been some kind of early production samples or test runs for paints apps or something to that effect I think.
Whatever they are, they are completely weird and cool, and make a fine addition to my collection. I'm definitely making a point to keep hunting for strange stuff like this from overseas. The seller sent them in a padded envelope all the way from China but they arrived safely so no complaints here.