[2020] Yellow Weapon Parts not showing up in pouch

If you go into your Inventory > Pouches > Currency, you should be able to see the counter for the number of Weapon Kits that you have, which should increase with the ones you have just picked up.

These will be used for Weapon Recalibration, and there is no specific rarity needed to recalibrate different types of weapons, so that's why they all show in the Weapon Kit number.

Hope I made sense there!