Oh man! Probably a lot! Hahaha What kind of eggs do you have? Are they made of gold?Plus, I don't think a yak calf will fit in a flat rate box... though they are usually around 35 lbs when born, so they aren't over the domestic weight limit! It's just cramming it in there that's the problem...
Yeah, if nothing else, I'd think mom might get cranky... lol!