I have some Polish chicks I'm going to post on the auction but was wondering If I can offer them for shipping? Should I wait until they are 6 weeks old??? And where do I get the box to ship them in? I know they will have to go Express mal with USPS but don't kbnow where to get the box, and what to do for warmth and food for them while they are in the box? How many should I send together? Would two be ok or will I need moree added for warmth??? I'm in MO and it is May so I think they should be fine... Please give me all your advice... Thanks so much everyone!!!