The person that ships the eggs has to put the hold on the form when they ship. Writing it on the box does nothing!
It only works to put that on the form if the receiving PO is a designated holding facility. Otherwise, you write it on the box and hope they go ahead and read it and call.....Some are snotty about it and purposely refuse to call even if asked just because they don't have to if they are not a designated facility. I have to say, that more often than not, it does work to ask them to hold it.