Well, he doesnt, really

Of course it depends on the location, but generally speaking:
Magazines are worth say 100 a piece,
The holster alone is worth some 250 at least, not to mention the loading tool.
So the holster + tools + mags together are worth some 500 alone (Euro).
A mint byf41 at some 1500 + the additional kit can easily raise at least 2000 Euros on the right spot on the European marketplace and at the right auction much more.
RWS, if you can get it for less than the price I mentioned, you are paying a very good price! If you get it for Steinars price (700-ish) you got the deal of the century. It's important to separate the shooters from the collectors.
This rig is in the area of high-end collector guns, not shooting material.