Amazon.co.jp: レゴ Star Wars AT-AT Walker 4483 [並行輸入品] : Toys & Games
Lego 75538 Super Combat Robot
LEGO® 75538 6353459 - ToyPro
Ambush on Ferrix - LEGO Star Wars 75338
LEGO® 75538 6353459 - ToyPro
LEGO Yellow Ramp 8 x 8 x 4 (75538) | Brick Owl - LEGO Marketplace
75538 Super Battle Droid | Brickipedia | Fandom
I have seen some say this was never released but was in some kind of production. I am 100% sure i saw this on an shelf in toy-store called "leklust" in sweden.