Well, here are some files for posterity.
The QR code links to
http://weixin.qq.com/r/2nVqclHEFgxprRUR9yDI which redirects to a dead wechat link. The sticker just has safety info it seems.
Maybe someone out there has more info. I guess it could be a KO, but it doesn't have those mitten hands the KO has (his finger isn't pinned). It has the cross molding inside the clear plastic on his waist. His chest flaps, while kinda floppy, do tab in robot mode and are flush.
Slimer is not shiny and has some black marks on him. But it could also be due to improper storage and age.