Are you referring to files that have been deleted? As in, file name length set to 0xE5 and allocation chain wiped.
PS: If any staff are...
21st century journalism at its finest.
Story posted April 17 2018 on Wired.
I think most of those guys/girls are here: http://www.psxdev.net/
maybe they have a backup or more information for you if you need any.
Separate names with a comma.