Unfortunately, that's not the only missing item. I got around to double-check his inventory today, and found the following items to be absent:
Wintercress Syandana
Lemnas Staff Skin
Twin Grakatas Towsun Skin
Deimos Velocipod Prex
Deimos Carnis Prex
And technically, the Orokin Catalyst and the mod packs, but that's probably intentional.
EDIT: I've checked this on PC, but the same issue was reported on PS4 as well.