It is very very difficult and rare to obtain paperwork on a snitch because a good snitch is someone federal agents want to keep concealed to aid with other cases or for their own protection. Also unless you elect to take the trial to jury trial, unlike the movies most snitches dont have to testify unless their presence is necessary or they are witness to a crime. Most snitches can take a plea deal so long as what they say can lead to significant information or a breakthrough in a case but not necessarily a conviction. Which is what makes them even harder to detect. Snitches are often kept confidential or away from the file for their own protection and for future use depending on the case. This is very popular in cases such as cartel or large syndicate cases where federal agents are trying to bring down large organizations.
Even if you tried to find Tip's paperwork unless you work for the attorney general or FBI or got snitched and request it, that's not going to be public record you can find and pull. If the FBI ever posted Tip's paperwork he could sue the entire bureau for hundreds of millions and win.
