[Pyrosis]

If you can answer the following questions, I might be able to give you some better insight into your account investigation and as to what they are actually examining right now.

How long have you played on Full Tilt?
Do you always play high stakes HU matches?
Did you recently make any credit card deposits?

Also, check your HH and see if there have been any new and erratic players that have recently lost a lot to you. You might be the victim of a chip dump and be completely unaware of it.