Ok, I got this ticket response yesterday (Monday September 30th):
Greetings, [redacted]!
Blizzard Support Team welcomes you!
My name is Game Master [redacted] and I will handle your request today.
I understand that you are still having an issue with the Guild Bank.
As my previous colleague stated, our developers heard the players’ feedback, and I am happy to say that the bugged issue is resolved.
However, we will ask our players to wait for some time, since the mails sent to the Guildmasters may take several weeks to arrive.
We don’t have any information on how many letters there will be or how long the entire process will take, but I can assure you that the guild bank goods will be sent in parts, in separated mails.
Customer support cannot speed up this process. Be sure to check the mail!
Thank you for your consideration, patience and for sticking with World of Warcraft through thick and thin. It is truly appreciated.
If you have more questions, please do not hesitate to come back to us.
Kind regards,
GM [redacted]
Blizzard Customer Support Service
So that’s a copy paste, except for the names. I’m very sad to admit, but witnessing how they have handled these deleted guild bank items in the last two months… I do not have any faith in this response.