I lost my file - desperately need help!!!

So about a month ago, a client sent me this indd file that another dev had been working on.  I have been working on the file since, normally I will open indesign and the image would be there in recent files and I just open in.  I worked on the file last on11/01. Last night, I wanted to do some work in it, so I opened indesign and was surprised that it wasn't there.  I checked file > recently opened, when I try to open it from here, it says "either the file does not exist, you do not have permission, or the file may be in use by another program".

I have no idea where the file is located, I have been opening it using the recent shortcuts for weeks.  Can any advice on how I can recover this file?  I have the pdf that I created on 11/01, is it possible to fine the indd location from the pdf?