Well the chicks are outgrowing boxes FAST! So Walt and Dena brought us a wardrobe box. We had to do a bit of a patch job to make it tall enough to keep them from getting out. So it may not be very aesthetically pleasing, but they have plenty of space now! This is a good thing since they really enjoy flying more all the time. They are less and less fluffy and more and more feathery all the time!
We have also discovered that giving them a little food throughout the day helps keep the box much cleaner and we waste a whole lot less food!