The larvae are Allomyrina dichotoma (kobuto mushi). My son and I found them in a park near our house. I kind of feel bad taking so many, but they were so easy to find it was hard to stop. I plan on keeping some imagoes and breeding, the rest I plan on giving away to my children's friends as long as their parents are ok with it and understand how to take care of them.
I agree. That was just a old cooler I had in the car that I used temporary to transport home. I split them up into the two tubs you see in the second picture