Nice rifle. Stock will clean up easily with a few wipes of a cloth with acetone. Bronze wool and oil will handle that minor surface rust and she'll look fabulous.
It'll look pretty good unless the stock is sanded, but stock looks good in those images. Still, you can't say it's un-messed with.
I'm not a fan of that one image of the recoil lug and the cutout (the gap) but it's not the best angle and definitely not enough images.
What are they asking? Surely it's worth 4k and maybe up to 5 but after that it becomes a question. To me, $4500 tops but I'm not needing nor wanting another G41.
Can you recoup any investment into it if you decide to move it afterward? That's how to justify the price.
Again, safe at $4k and maybe $4500, not so sure after that.