Back in the BC days, I had this happen before with a lot of very expensive materials. I was transferring materials from one vanity bank to another. Its like Bliz diverted the materials for almost two weeks, then decided to send them on. It was before I knew anything about botting, and this could raise flags. I would
never mail like that now, knowing what I know now about server-side detection.
As to whether you should open a ticket, there are obviously pluses and minuses to the action. I don't think you'll be flagged for asking where your stuff went, as any legitimate player would be
highly upset with such a loss. However, I would hesitate to bot on an account that asked about it, due to the GM contacting any toon on that account with regard to the matter. If you were botting at the time you were contacted, that indeed would be bad news. There is also the problem of the GM asking why you were moving so much expensive material, and possibly from whence it came.
Just more info for your consideration,
chinajade