Figured out the lootbox thing. In #RewardFeaturesProfileData.json, there is "instantLootboxInventory":[]
Between the brackets, you can type in "lootbox_rare","lootbox_rare",... to create lootboxes. For example:
For example, "instantLootboxInventory":["lootbox_rare","lootbox_rare", "lootbox_rare","lootbox_rare","lootbox_rare"] would give you a stock of 5 rare lootboxes.
If you copy-paste enough to get 500 boxes, that's probably more than enough to get every outfit piece.