It really sounds as if this is a 'second' and that is perhaps why it was never issued...If you don't send it back then you have to decide whether to keep it as it is, sell it on as a rarity or finish the factory's job...
If you're not confident about doing the work, maybe talk to someone like Frank Brown who makes the canvas bags etc. I'm sure that he has the equipment for setting eyes and probably an original coat to work from.
