I think I can guarantee that if someone has 30 "original Colt" magazines for the .380 caliber Model 1908, they are neither original nor Colt. There are some good repros out there and some bad ones but original Colt magazines will run from $75-120 and you don't find stacks of them at a gun show. (The "Colt" marking means nothing, whether on M1908 magazines or M1911 magazines. Colt lost that trademark battle when the makers simply noted that "Colt .45" and "Colt .380" identify the gun/cartridge, not the maker of the magazine.
Jim