I am in "list 1 - KYC" and I have received my iotas the last weekend.
But I don't know what is this finalization letter as I have not received it.
I have been able to speak with David (I have emailed him and obtained just one response, but it was enough to agree for a donation)
In such a case, perhaps the finalization letter is not useful (just an hypothesis, CFB will perhaps confirm it)