DAM I am sorry for your experience, but if I may throw in y 2 cents I'll caution perhaps you are getting on your own way to a resolution..even if what you seek is a warning. If you want to warn us about a specific dealer by all means tell us what dealer to avoid, otherwise you are just warning us without really giving us the tools to avoid fraud.
On the other hand, there is no reason why you cannot accept a refund while still continuing the procedure with the FBI and other authorities, specially if, as you say, the FBI was involved prior to the refund offer. You could just accept the refund, at the very worst you are not delaying anything as the authorities would continue their proceedings, at the very best you get your money back and inform the authorities the dealer has resolved the issue. For all we know, or you know, the dealer may be actually honest and willing to make it right, we won't know because you are not allowing him to prove it either way.
Now, you could argue that he misled you regarding the Master Coaxial existence by telling you you where buying the latest model, and while I agree that deception is disappointing and hurtful and takes advantage of your good will it is far from criminal on itself, specially if they are willing to amend it.
I am sorry if I am misunderstanding your warning and content, but something does not seem to be quite right on your end.
Of lesser relevance is the fact that you list three mistakes that are not mistakes at all. You don't WANT to make Celebrity responsible but you do mention them by name and list as a mistake to follow their advice...what's the mistake? you asked and they told you where a good dealer was, they are not the chamber of commerce. Its like me being mad because a hotel concierge recommended a show I didn't like.
Mistake number 2 is also not a mistake, you where deceived (if you did ask if it was the latest movement which is a very specific question) being deceived is not a mistake, it is an offense .
And mistake number 3 is also not a mistake, They offered to exchange the watch for a new one (the second time this offer is offered to a forum member to my recollection with also similar bad results) That is not a mistake, it is a resolution that seems fair and actually to your benefit. If the mistake was to trust them...ok, but I think as you say the dealer trapped himself into a loss since the Master coaxial probably costs him more than the coaxial...but he offered a refund...and 7 to 10 days is perfectly normal for bank and refund proceedings to take place.
Am I missing something?