Thank you. I didn't realize it was a hidden folder. The .Rproj.user folder is there.
In the one project I was working with yesterday, there is a "shared" folder as well as 2 other folders with 8 character names (2A65428F and 555E9848). The one starting with "2A" was created yesterday (after the move to the new computer). The one starting with "55" was last saved yesterday (before the move).
Under each of these, there appear to be two subfolders, "per" and "prop". In the "55" folder, both of these subfolders have dates from yesterday at 5:14 pm which sounds about right. Inside "per" are two folders called "t" and "u". The folder "t" is also dated yesterday and "u" is dated from July which may be when I created the project. Inside "t" is a list of files, each of which seems to be pointing to a source I had in my environment on my old computer.
It seems that RStudio ignored the "55" folder and created the "2A" folder instead and is now referencing that.
So, I guess the question is why RStudio is ignoring the "55" folder.
From looking at my old computer, the "55" structure is slightly different. Under "per" the "t" and "u" folders are empty. But there is another folder called "s-B28FA85E". This seems to have all of the proper sources listed there.
So, it is a bit of a mess and seems to be changes to how RStudio is managing sources.