All newly created SIVA Cache Keys will be sent to Postmaster if the player's Consumable Inventory is full upon creating the first key.
If a player creates a SIVA Cache Key by combining 10 SIVA Key Fragments while their Consumable Inventory is full, the newly created SIVA Cache Key will be sent to the Postmaster. If the player then creates space in their Consumable Inventory, and creates another SIVA Cache Key, all newly created keys will also be forwarded to the Postmaster.
Once a player has entered this state, the only way to create a SIVA Cache Key without issue is to return to Orbit. All SIVA Cache Keys affected by this issue can be safely recovered at the Postmaster. Please note that this issue may push older items out of the Postmaster if the Postmaster is currently full.