Thanks for posting this.  I just noticed that one of my 2.5 week old chicks has a slightly crossed beak, and yours is one of the very few stories I found that has a happy ending.  I don't think mine is going to end so well tho, as it looks like my chick's beak is a bit worse today than it was yesterday.  She's still eating normally, but I can't watch a chick starve to death or force feed her. I don't fault anyone for taking care of a special needs chicken, but I can't do it.
 
I've had very bad luck with these chicks, I lost 6 of this batch of 15 due to being shipped in cold weather.  It would have been nice if the cross beak chick had been among the 6 that already died, but now it looks like I'm probably going to have to cull this one (which is a source of great anxiety for me as I've never done it before).  I'm glad that things turned out well with your chick.  I'm hopeful with mine, but trying to be realistic.  I started putting vitamins in their water in case it's some sort of deficiency, but that doesn't seem as likely as some sort of genetic defect.  I guess I just have to wait and see.