cloudHQ can be used to migrate all or just selected Box accounts to Google Drive.

Single user migration:

If you are looking to migrate just one Box account (either a personal or Box business account), then you just need to create a migration sync pair from an individual Box account to Google Drive account or to Google Drive Shared Drive. The main limitations of that approach are that sharing metadata is not migrated.

The instructions on how to migrate a single Box account to Google Drive are here

Multiple user migration:

If you are an admin of Box Business or Box Enterprise domain and G Workspace then cloudHQ can:

  1. Migrate all your Box accounts to corresponding Google Workspace accounts. All sharing metadata will be migrated too.
  2. Migrate your company-wide shared Box folder to Google Shared Drives.

The instructions on how to migrate your Box Business or Box Enterprise installation to Google Workspace are here