Buzzro,
Regardless of who you are working with...make sure the points are clearly stated in the contract and reference the year from which they are coming. Any banked, borrowed, "holding" points etc. should be disclosed from the start. While Disney won't let you personally verify another member's account, you can protect yourself through the written contract. Any discrepancies will nullify the document and the title agency should catch it.
Hopefully your Broker knows what they are doing and it shouldn't be a concern!
All the best,
Shontell