yeah you can only enter once no matter how many stores you sign up for. Unless you have a different name and ID or have someone else sign up for you. The main purpose is to prevent one person from entering and winning multiples. Thats why you have to enter your details when setting up the appointment and then they verify that details again when you check-in at the store. The "raffle" and each entry is done through one corporation system so theres no employee rigging and theres no duplicate entries.
When you win, they send you an invoice and you checkout and they ship the shoes to you from a corporate warehouse. Theres no pick-up option and the shoes are not stored at any of these stores.
I certainly hope all who entered are able to purchase.