I know that Graham, my point is that AE get the specific TS parameters of each and every driver they produce, and supply the buyer with these. Construction tolerances obviously mean each driver will differ from the published guideline parameters, but this isn't considered till the driver are ready to be dispatched.
With your drivers, I would have thought they'd have been measuring them as they went and would have had to measure them when finished to check their tweaks are correct, hence they should IMO have the parameters, more so than usual. I would have thought they would have given you these, even if they don't supply them as usual, given your drivers particular uniqueness.
Either way, I'm sure they do have them knocking about.