Zip zap, I am a golden robot man.
Rare 16mm Footage From 1976 Of R2-D2 And C-3PO Actors Trying On Their Costumes

This is some rare (possibly explaining why we hadn’t seen in before) 16mm footage captured in the props department at London’s Elstreet Studios in 1976 of actors Kenny Baker (R2-D2) and Anthony Daniels (C-3PO) trying on their droid costumes and getting used to moving around in them. There’s also some footage of other unfinished droid props for use in the movie. Obviously, if there was any way to stretch this footage out to 2 hours 16 minutes and release it instead of The Phantom Menace, George Lucas should go back in time and do that.