I have found a wrong caliber here and there in a few of my winchester boxes. Guess it's the price you pay for cheap ammo I'm glad your wife caught that. Better safe than sorry.
That's really more of a fun surprise for me...like getting a fry in your onion rings at Burger King.
I've never had ammo come broken in the box, except for one cracked neck on some old Hungarian surplus 7.62x54r. I've seen lots of Blazer Aluminum cases crack after being fired though, which is why I don't buy that stuff anymore.