Hi guys
We had this issue a few months ago and it is to do with the config of Intel MAC/finder and a san network, if you have folders created on a external drive and then you move files around or whatever you can get a massive issue, in our case we lost 1.5TB of stuff, apple are aware of this but wont do anything about it …. if you have a PPC this will (hopefully) be able to see your folder but my guess is it has gone, sorry