Based upon those photos, that's about average wood for a walnut-stocked CZ. As I said earlier, the finish that they put on the 452 and 455 Americans was nicer than on the non-American models. The end result is that you've bought a gun there with nice-looking wood.
All that said, you need to get the gun into your possession so you can see it with the naked eye. CZ finishes photograph differently under different lighting (this is true with all of them, but even more so with the non-American models). Wood grain features come through differently depending upon the camera and the light angle, so you can't always tell from a photo how it'll look in person. It's probably going to be a very nice looking gun.
That's not a picture of a chamber that you posted. Those are just some chatter marks in the bolt guide insert that the magazine seats up into. As long as the magazine inserts and removes normally the chatter marks won't impact functionality. The more important surfaces are the top rails of that insert where the bottom of the bolt slides fore and aft. If you want, you can remove that piece and inspect it more thoroughly after you remove the magazine well. Here's the part:
https://shop.cz-usa.com/ProductDetail/513002918820_Bolt-Guide-452-Wmrhmr
As for the barrel, just clean it and start fresh. Be aware that the bluing salts that remain in the barrel post-manufacturing are kind of tenacious, so if it hasn't been shot much or at all, it'll take several patches and probably some brushing to get the barrel to the point that the patches stop coming up with a lot of brown stains. In my experience (with more than 20 CZ rifles) they don't need nearly as much break-in as internet lore claims in order to start shooting close to their best. Also be aware that you can play around with the torque settings on the action screws and it can impact accuracy. And as with most guns, wood-to-metal contact can be a factor. Best approach is to clean it, shoot it, and go from there. Chances are that it'll shoot very well for you. If not, or if you want to make it as good as it can be, you can start systematically working though the usual points to find what it needs to improve shooting performance.
If you want to learn more the 452 and how to get the most out of it, go here for a pre-assembled set of sticky threads:
https://www.rimfirecentral.com/forums/showthread.php?t=234957
For other other discussions on the 452, 455 and 457, go here:
https://www.rimfirecentral.com/forums/forumdisplay.php?f=18