I have been building some models using model builder in a toolbox & saving them every step of the way. However, when I was building a new model,ArcMap crashed yesterday and I subsequently lost all my models that I had built over the past two days (the older models are still present). Any suggestions on what can be done? I tried opening a new map to see if I could open the models but that didn't work. I also tried refreshing and checking on ArcCatalog. I am using ArcMap 10.5 and haven't migrated to a new version or anything.