cloudHQ can be used to sync all Box and Google Drive accounts.
This means that Box and Google Drive accounts will be the exact mirror of each other.
Single user sync:
If you are looking to sync just one Box account, then you just need to create a two-way sync pair between Box account and Google Drive account. The main limitations of that approach are that sharing metadata will not sync’d.
The instructions how to sync a single Box account with Google Drive are here
Sync multiple users:
If you are an admin of Box Business or Box Enterprise domain and G Suite then cloudHQ sync all your Box accounts with corresponding Google Drive accounts. All sharing metadata will be in sync too. Instructions how to sync your Box Business or Box Enterprise installation with G Suite are here