Letter from Vault-Tec (Fallout 3)

A  can be found randomly in mailboxes of ruined houses across the Wasteland.

There are two versions of. One informs the recipients that "their application to get into a Vault has been denied, however Vault-Tec will retain their deposits" in case an opening appears. Another version is addressed to Mr. and Mrs. Gomez, informing them that their application to get into the Vault was accepted. This is an example of the dark humor that is an inseparable part of all Fallout series games.