Well, thanks for the kind word, yes, I own a pretty healthy library, but I don't cut and paste infos. It comes with a lot of time spent on researching and collecting guns.
A cracked Mauser stock is far from rare... It's one of the "flaws" that comes with the staggered row magazines, when the gun if fired, the front lug compresses the stock back and the tin walls surrounding the magazine bow, putting a lot of stress on the small internal webs between the magazine and the trigger well.
In my opinion, it's a good argument for an eventual buyer to lower the price but it's usually easily repairable. Only thing is that it's much better to proceed to a good bedding job after.