Is this something that should have been talked about yes. My guess is past owner got it that way and just blew if off as a minor issue that doesn't effect game play. Now not being able to see discussion in sale or ad that was seen can't say it is all bad unless it was billed as nice/mint game aka 10k by x-mas unicorn type. As others in thread have said new game 5 yrs or less i be fussing. But over 10 years old probably routed at one time you can figure some cabinet damage.
I haven't had many games sold to me hiding major damage yet. But then again i'm buying nice /players or worse games sold in the as is or semi working so i can't expect top shelf stuff.