I have to give it up to the Utica, MI Best Buy. after the disasters that were the Lucario and Rosalina launches, this was by far the most organized launch i've seen.
They had enough to cover preorders plus 7 extra MK as well as extra Ike, Sonic, Mega Man, and DDD. They handed out tickets for the extras, and walked everyone to customer service at 10am. Each amiibo had a post it note on it with the name of the preorder customer and they checked ID's. The extra amiibos had post its with numbers that corresponded to the tickets they handed out. As each was rung out they checked it off a master list.
If only every retailer could be so well run and organized.