An interesting question.
I found this informa on the disney site. I would presume that it is the same for all the cruise lines.
You must submit proof of residency by submitting one of the following:
- Florida Driver’s License
- Florida Identification Card
- Florida-based military ID
If you are not in possession of one of the above IDs, one of the following documents must be provided. It must be within 2 months of the Disney cruise booking. You must also submit a corresponding non-expired government-issued photo ID.
- Monthly mortgage statement
- Renter’s lease agreement
- Current automobile registration, insurance policy, or bill
- Current homeowner’s insurance policy or bill
- Current utility bill (power/phone/cable/water)
- Mail from a financial institution, including checking, savings, or investment account statements
- Mail from a federal, state, county, or city government agency