The boxes were all generic. Nothing to indicate which box went with which doll.
I would want the paperwork as it is specific to the doll and an integral part of the doll. IMO.
Displayed -preferrably behind glass-is fine.
If it is a doll I MUST have, I will pay what I can afford. A number that can fluctuate dramatically in the current economy.
If I REALLY, REALLY must have it, and it is rare but no papers...then if I am sure it is not a doll that could be counterfeited, I would go for it.
Counterfeit? you ask. Well, we have seen amazing copies of My Favorite Witch. We have even seen the early Gene convention promoter selling blank COAs for the event dolls from her con on ebay. These may have even been signed by Mel, but I not positive on that point.