Yeah, we went and changed the password right away and have looked at the 2FA as well, just to be sure.
The very specific types of things missing still doesn't ring as a hack to me though. That would be like a thief breaking into your house and only stealing all your left shoes, and leaving the right shoes. All things missing were in bags 2-5, not the main backpack. All things missing were crafting related in some way, with the exception of gold, which wasn't much, we're only level 33.
So I don't know, seems strange. And I have to admit it rather bugs me that Admins are just marking it as invalid and leaving it without even a "we can't" or anything at all.
I'm still with the original question though, anyone ever have this happen....