Failed to save and over-wrote sequence

On a couple of occasions I have opened a mosaic sequence and at the end it has asked if I want to save the sequence, for some reason when saved I found that the sequence had been over written with one of my other sequences. Is there any way to recover the lost sequence, as it was a mosaic it had 4 images within the sequence that had been produced by the Framing and Mosaic Wizard (FMW). My only option seemed to have to go back and try to re-create (exactly) the part mosaic using Framing and Mosaic Wizard - no easy task. Is a copy of the 4 part image that is draw as part of the FMW process stored anywhere?