I sold it somewhere around when I was questioned in relation to my account freeze. If it was earlier or after account was locked, I truly can't remember. But I do know who the phone was sold to, and if I was ever received any information to that third account, I could at least confirm or deny if he is one of the guys I sold the phones to. I can even name them both (privately) if that would help.
Or... we can reverse the process, where you ask that person who buy your phone whether they created an account on BC, what UID they have, when, etc. intstead of guessing what and how?
And yes, if you can do that, it might help us advance with your case. I mean do as above, asking them the question above, not sending me their name... It'll be useless if they're not related to this case.
As for how you log-in to the active account, I used phone + password. What I am telling is I don't know which one was exactly which, but I am 100% sure that one of these 2 accounts without activity were created out of a technical bug I previously explained, and that second account was NEVER used. Retracing it back a year, especially now that I have not my old phones with me would be impossible.
And holy, I really appreciate your thorough questioning, and once this issue is resolved (either here on in court), I'll come back and compensate you for time. You gave me already few different insights that were right in front of me, but I wasn't even looking at them. My lawyers are already drafting claims for Belize and Cyprus courts and the things you pointed me to helped A LOT! Thanks!
And what about how you access the account all this time? To LuckyWalker69? Do you use Google auto-sign-up or phone number?
edit:Actually, I can re-trace it, based on e-mail confirmation link:

Unused account was created manually, and the one I've been using up until closure was the one created with Google SSO option. This is my understanding based on the account creation date (which I can barely see) and considering that for Google SSO, you don't need to verify e-mail address.
What is this about?