An original untouched dou41 is very difficult to find. As far as the price goes an all correct one in nice shape would probably be over 2K but if it is not correct, sanded stock and so on then it is probably worth $400
Most of these may be GI bring backs with m/m bolts only, worth more then 400 certainly? And I don't know if anyone would pay 2000+ for one, no matter the condition. I own two and both are original except for the bolts. In any case they do not show up for sale often!
In my opinion:
Bolt mismatch with untouched wood and otherwise correct rifle would be worth $800
All correct matching and untouched $2000
Sanded wood, mismatched bolt would be about $400 or basically whatever shooters go for these days.