Here are some pics of my Model 10-8 New in Box.
Rimrom
FYI, your Model 10 is LNIB, *like* NIB. NIB typically is understood to be truly new, never before *sold*. Never before shot would be unfired LNIB.
It's like cars. Taking a new car off the lot, it is no longer a new car, but a used one. Even if the car is trailored off the lot, and never driven it's not new anymore.
As for value, I find this kind of funny on this board. Typically, for collectors of any item the value lies in a few things, mostly condition and rarity. If it has one but not the other the value suffers greatly.
Assuming this Model 10 is a typical one it's not rare, at all. While it's condition is unfired, like-new, with all the accoutrements it's still not rare. It's value will be right along with the other common model 10s in similar condition. Sounds like
fiymo has it nailed pretty good.
An unfired common model 10 is still a common model 10, and therefore not of significant value.
If you're not going to shoot it, and could use the money sell it for as much as you can get. Maybe someone will pay over-market for it. If you don't need/want the extra money and still appreciate owning it keep it.