I took it upon myself to do exactly what I said and call 407-WDISNEY to get the top secret "special" number.
This is the number that I was also able to get 2 weeks ago by just mentioning to a reservation CM that I wasn't sure that I needed tickets b/c I had all these old ones. I had these same tickets a year ago and asked and they told me only at WDW, so this does seem to be a change. Doesn't seem to be a hidden number or not avl to the public- this CM knew exactly what I was talking about and had the number at hand.
The number is (407)566-4985 and they will gladly help you.
They are only open Mon-Fri and will only check 3 at a time.