I told them that we were coming in April and that I needed my membership number to be able to buy a Gold AP 60 days in advance for my FP's. They asked no questions, just looked for my number. When they (member services) couldn't find it they sent me to another department (member admin) that searched through the piles until they found me. They said that I was 3/4 of the way down and keep calling daily. It took 3 days.
The key is in the wording. Member services told me that Member Administration could look up my number, and sent me to that department. The first time I just asked and was told "we can't find you in the system". What I've found with Disney is that if you put in your question that you KNOW they CAN do it, they will. Every time after that when I called I said "Member Services told me that you could look up my membership number so that I can buy my Gold AP's before my 60 day FP date" and they all said "sure" and looked.