“This is a set of false Citizenship Papers. They look authentic enough, but you doubt they could pass a serious inspection.”
The false citizenship papers is a miscellaneous item in Fallout 2.
False papers can fool the outside guard into letting the Chosen One into Vault City, offering access to everywhere in the city except Vault 8.
The false citizenship papers can be acquired from Skeev for $200 (or $150 with the appropriate skill check). Additionally, the Chosen One can collect his money back by intimidating/threatening him.
The false papers will be recognized as fake by Sergeant Stark and Joanne Lynette inside the city should they get an opportunity to look at them, causing them to be confiscated.