PA-25 Hoffman Prop & STC Paperwork

Selling my 4 blade Hoffman propeller and STC paperwork from my PA-25-235. Prop has missing material from 3/4 tips and possibly needs overhaul. Hoffman propeller would like it shipped to Germany for overhaul but there are shops in the US that can repair it. I replaced prop with new McCauley and have no need for it. It is supposedly 15-20 decibels quieter for noise sensitive operations.