I bought a time capsule 500GB off Ebay from a seller with a 100% satisfied rating. It was said to be MB764, but when I received it, it was model A1254 which I found to be MB276. Also, it did not include the software, or user manual when it arrived which was not stated in his ad. I filed a complaint with paypal, when the seller would not answer any of my emails for return of the item. He is disputing it. My question to anyone who owns the time capsule is: Does the user manual and software disc show model # or something that would identify the time capsule model? I would guess that the manual would not include any information on simultaneous dual band or guest networking. Any help would be greatly appreciated.