Hi Joe, thanks so much for your response.
The project and its files are included in Finder when I click “show package contents.” I had already tried opening the backups in FCP and the only FCP backup that shows the project properly is the first backup. Since that’s too old to use, I will try saving the project as an XML file and opening it or making modifications in Finder to the library I duplicated. Thank you for your help! Hopefully something works.