C4 update 28th March

It should be a simple process to determine if there is a saved copy of your previous work. Just click “File → Open” and have a look around. There is a topic about this exact scenario on the FAQ Thread FWIW.

Also note that you should have gotten a “popup” message when you first opened the new notebook that explained how to find your saved work. Most likely it literally gave you the name of the saved file. At least that’s the way it worked the last time I went through this scenario, but it’s always possible that Coursera has broken it in the meantime.