Eight different code pieces exist, with the characters of each changing every week. Code pieces expire weekly on Monday, no matter when they are acquired.
Player characters with a code piece will get a notification before expiration, indicating they will soon expire and be removed from the inventory.
- Silo Charlie code pieces can be found on both scorched officers and feral ghoul officers.
- Player characters can complete the repeatable Hide and Seek and Destroy quest to pinpoint the location of code pieces around the map.