Here's a good link with different methods posted...I use different things for different dogs, so I like this page!http://www.squidoo.com/flyballboxturn#module8282925
I started with target training...targeting front feet to a piece of duct tape, and moved it on to the shoot...with a jump in front. Then clicked for getting all the way up to "touch". At the same time I was training the touch and on/off the shoot, I was working on the A-frame, steps, flyball box, shoot, etc...to reinforce an agility "two on/two off" (back feet on the surface). This really helped them understand that the back feet got the click/treat.
That's a really basic idea of what I did with my guys. I would highly recommend watching some Springloaded DVDs or get someone to come in and teach you all...via a workshop. It's much easier to see than to read. Come down this way sometime and do the sessions with Julie Jenkins...worth every penny. I'm not a big fan of the Robbins though...I think they were a waste of money.
As for what he's doing now...STOP
If you want a decent box turn, you CANNOT continue the way you are going. Letting the dog run willy nilly up the box and letting them work it out is dangerous and stupid. You're going to ruin your dog that way. UGH.
My dogs (team dogs) don't even start running to the box until their box turn is SOLID. Until then, they do recalls over the jumps and work on passing and stuff. Box work is separate until they are good and consistent on the box.
"I don't have any idea if my dogs respect me or not, but they're greedy and I have their stuff." -- Patty Ruzzo
"Dogs don't want to control people. They want to control their own lives." --John Bradshaw