I'm pretty sure that they have to be at least pea sized before they're shipped, maybe even bigger. If it was an in-state shipment, then I don't think it matters. Someone else who actually ships will be better to answer this question.
I know msj generally ships her brigs at dime sized. She told me that, yet i had no idea how big that was until pot luck landed me with a dime at work lol. Tho i have recieved brigs at about the size of a pea.