These maybe are the droids you are looking for. A funny take on the the movie saying with Stormtrooper figures looking through E-bay for the R2-D2 and C-3PO toy figures.
Alvien was the name of the Stormtrooper squadron that was assigned to set up blockades in Mos Eisley to stop R2-D2 and C-3PO from fleeing Tatooine.
In the first draft of Star Wars Artoo Deetoo was designated A-2 not R2-D2 .
According to the original Revell model kit, R2-D2's serial number was Y477Q90 and the instruction sheet says that R2-D2 was manufactured by Imperial Cybernetics Corporation.