Releasing any 'pet' animal is never a good idea, a responsible pet owner would know that. Do a search on here and you'll see the numerous ducks, geese, dogs, cats, you-name-its that people have found once they've gotten away or been dumped by their owners.
Truly, if you are so limited on space or feed that you want to 'turn loose' 3 button quail, I don't think you should keep any animals at all. 3 buttons take up about 2 sq. ft. of space and probably eat a whole 10# of food in a year. Buttons are not 'holding' type of animals, they are much too...