Many thanks Ross. The solution was 'easy' as all the files to be moved were in a single folder and not in multiple folders.
To Test
gam redirect csv ./sheets.csv user <Owner Email Addreess> print filelist query " '<Parent Folder ID>' in parents and mimeType='application/vnd.google-apps.spreadsheet' and createdTime>='2022-08-01T00:00:00+08:00' and createdTime<'2023-07-31T00:00:00+08:00' " fields id,name,mimetype fullpath
You can then view the sheets.csv file to make sure that these are the files you want to move. Note, the +08:00 is used as my time zone is GMT+8.
To Move
gam user <Owner Email Addreess> update drivefile query " '<Parent Folder ID>' in parents and mimeType='application/vnd.google-apps.spreadsheet' and createdTime>='2022-08-01T00:00:00+08:00' and createdTime<'2023-07-31T00:00:00+08:00' " parentid <Destination Folder ID>