This will be interesting, If they bounce back or returned to you, they should at least ask you for a bitcoin address to send to. (I dont know if you can send bitcoins to an address that it was sent from) but, if you don't see those btc again. It will bolster my theory that mybitcoin was a total scam and not a victim of being hacked. Keep us updated on those bitcoins. You should at least file a claim with them, to see if they show up. or look at the blockexplorer and follow them. This is interesting..