I know a guy who knows a bit about them...
At this point less than half the set has been confirmed with a TTT back. As to whether or not they all were possible that way, I believe so, while the other longtime T204 collector that I used to collaborate with did not think they were all possible with the TTT back. So, it is still undetermined.
Roughly 2-3 per hundred come with a TTT back as sort of ratio. Based on early complete sets offered in the 1990's/early 2000's, when a set might have 3 or 4 TTT backs randomly included. Collectors at that point did not seem to chase or be able to find the TTT back to accumulate more.
And, yes PSA and SGC do now label them as such, but did not in the early days.
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