Yeah, doubtful. Probably never will get them back. Years ago at a traffic stop I had a pistol confiscated. I didn't have a concealed permit but it was legally stored. I was young and dumb and took the ride for reckless driving because I PO'd the cop. Even though they illegally confiscated it it took me over a year and a judge's order to get it back.
This was oily also. It wasn't until after I cleaned it with Simple Green that I could see the grain.