The Jose custom amp is said to be gone some time in the early 90s. They were passing it around shopping for a company to make his signature amp and it got lost.
In a Tone Talk episode, James Brown said that when Ed signed the deal with Peavey he was supposed to get the amp to study it, but the amp never showed up and it was never seen again.
So it's not the Jose but it's definitely one of the many custom/prototype amps Ed had made for him over the years before approving production models. James Brown also said Ed never returned prototypes so he made a bunch of them.