Does it have to be all one mix or all one breed or can it be both together, like I have a pure BR that is now laying daily, pure Millies, then a BTB Jap and a BTB Dutch that are with 2 Porcelain Dutches and a BTB female Jap so of course those would be mixed Dutch/Japs, and my BR Raoul has taken a liking to Belle my partridge Silkie? Probably dumb question but I would consider the whole bunch mixed then even though there would be pures in it right? And if I did this and when I send is it set in stone that I can only send 6, or can I send a couple extra in case of Post office damage? Thanks, Cindy