If drag & drop worked things would've been way easier for us. Unfortunately, it doesn't work like that. Volition can currently add entirely new entries to their asm files, meaning that they can add more assets to the game. We can't change the amount of entries in those asm files, as we can't edit them at the moment.
The items we "unlocked" here are perfectly usable because they do have their own asm entries and all of their files are intact. I always suspected that they discarded "bad" items that they couldn't fix quickly before releasing the game. Great examples for this are the pink "Lace Gloves" (files are in the game, but the women's variant morphs badly) and the "Apocalyptic Armor" (files are not in the game, has alpha disabled) from the Inauguration Station. For the rest of the items that are OK... I guess they just hid them due to console limitations. Everything I wrote here is guessing on my part, but perhaps a [V] will have a more accurate explanation.