Well, we set a deadline for 4th of December for confirming the mailing address, but we still get daily confirmations or address changes.
So, yea... we wanted to have the physical copies shipped in December, but it'll be January or February (latest!) now, as we want to make sure to reach every Godlike founder.
However, if you haven't even received the mail with the keys for your founder skins (and the request to confirm your mailing address), please send me a PM. Thanks!