They look you up and how many tickets you have, That is what you will get in wristbands, Now, you can certainly ask if anyone has adjusted their reservations to drop tickets, and if they have, you could be allowed to get additional ones,
When I checked in on the 11th, I had reservations for 5. She confirmed this with me but then I told her I only now needed 4. Not sure what she did with this information.