So awhile back I bought some Wizard’s Hats, which were free in the Gem Store. I had them in my mailbox but never took the item.
Today I login and my mail was red and showing 14/10 – so I look at it. I reported a gold seller, deleted their mail (only thing I deleted) and closed the Mail window. When I went back to check the mail, all of the Gem Store delivery mails containing the Wizard’s Hat were gone. I even still had some of the Baseball Caps from launch in my mail, but all newer delivered mail was missing.
I’ve tried relogging, checking my other character’s mailboxes, and deleted all mail so it shows 0/10, but even the backlog of purchased Wizard’s Hats aren’t appearing either (got 1 for each of my characters).
I’m thinking that when I deleted that gold seller’s mail, it somehow also deleted everything that was above it as well – including the backlog. Either that or there’s an auto-delete system for mail I don’t know about?