Please use the https://github.com/Islandora-Devops/islandora_demo_objects repo.
Storing objects for the Islandora Sandbox and other sites who want sample content. This spreadshseet describing this content is in a live Google Sheet: Workbench Metadata Spreadsheet in Progress.
To use this repository, install Islandora Workbench, and run Workbench using the included create_islandora_objects.yml config file (edited to meet your local needs). This config file points to the live Google Spreadsheet.