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 personal or Box business account), then you just need to create a migration sync pair from individual Box account to Google Drive account or to Google Drive Team Drive. The main limitations of that approach are that sharing metadata is not migrated.

The instructions 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 Suite then cloudHQ can:

  1. migrate all your Box accounts to corresponding Google Apps / G Suite accounts. All sharing metadata will be migrated too.
  2. migrate your company-wide shared Box folder to Google Team Drives.

The instructions how to migrate your Box Business or Box Enterprise installtion to G Suite are here