Here's the email with phone number. You could call the number and see if they are still doing it:
Your Disney vacation time is precious. So for a limited time, from now until December 31, 2006, were introducing a NEW way to check-in before you arrive, and its just for Disneys Polynesian Resort Guests!
Simply call us at 407-828-7120 from 110 days before your arrival (same-day advance check-in is not available). You can reach us at this number every day, 6 a.m. to midnight.
Before you call, please have the following information ready in order to streamline your registration:
1. Your estimated arrival time
2. Your payment method
3. The names of each person in your party
On your scheduled arrival date, your check-in information will already be confirmed and your check-in packet will be waiting for you at a designated advance check-in area.
If you arrive prior to 3 p.m., please stop by the registration desk and inquire whether your room is available. If your room is not quite ready, you can get started exploring the Resort or visiting a Disney fun spot until your room is prepared.
This new service is our special thank you in advance for staying with us!