I don't think Hestia or MH are considered BJD dolls, as they're not ball jointed or strung. With "true" BJD's there's no MIB value as they don't come in boxes like MH dolls do; they're in boxes designed for them to be taken out of and put back again, so it doesn't matter much at all I think. Hestia is not a BJD (they come on pullip bodies)
As for the value, I don't know. I don't think it'll matter that much to be honest, I get the feeling doll collectors put less value on MIB dolls than, say, pony collectors, but I might be wrong
maybe someone else with more hestia knowledge can explain this better