A folder in a drawer
I ran across this expression in a movie.
when a detective asks a witness what he saw,
he refuses to tell the former what he eyewitnessed.
and says like that:
"you don't understand me how I feel.
All I am to you is a folder in a drawer."PLEASE HELP ME< FOLKS!!
My humble opinion...
It probably means the detective is only interested getting the witness testimony, don't care for the witness him(her)self as a human being.
He just want to collect information that will end-up typed and filed in a folder as evidence for the prosecutors. Folder that can be filed into a cabinet or desk drawer.