I may have answered my own question. The search field at the top won't find anything in the spreadsheet itself. I had to use Search and Replace in the Google Docs Edit menu; then it worked.
Subject:
Message:
Re: Places to Dance
Posted by BallroomChick
10/10/2019 1:21:00 PM
These places have closed down. You might wish to update your list
Line 3053 Trail Dust Steak House Line 3060 Post Time Line 4991 Dance Etc Line 4992 KC Dance Studio Line 4997 & Line 5941 - Ballroom Head Quarters