I noticed when I right-click searched for qwardian backup none appeared. Later when searching using the term "hench" I noticed they showed up despite their listed name being "Back-up Uplink Device: Qwardians Trinket" I suspect the display name is not the same and the name being queried. Not a game changing issue, but a bit of a hassle if you want to list them and want to compare existing prices. That said if I'm correct it should be a 2 minute fix.
The difficulty being that to villains they are "Henchmen Uplink Device: Qwardians Trinket". (I believe they also used to have this name for heroes, The base ones have always been Back-up to Heroes)