Our Lego Star Wars III game went missing, we turned the house over looking for it. I think it may have "Accidently" gone home with one of his friends. Anyway as my lad was really wanting to play it I got a replacement pre-owned disk to replace it. Unfortunately the replacement game doesn't recognise the 73% completion that my lad had done in the game so far and he has had to go back to the start. The saved game data is there, but SW III doesn't recognise it. Any suggestions?