Advice on shipping goslings? Best age?

[RHRanch]

I want to ship some goslings to a customer. The goslings are 3 weeks old. Should we wait until they are older? What age is safe would you say? Gosling shippers, I need your help!

 

[lovesgliders]

I've only received shipments, never been the shipper before, but it's my understanding that you either have to send day-olds *or* older birds, as in like 9 weeks+ (basically grown) for chickens, not sure what age is the right one for geese.