Hi Carrol - Good news!  We have the tools you need to automate which box is assigned to an order.  Setting it up requires putting a few pieces together:

1. Save a custom package: _ learn more here_
2. Create a Saved Selection that assigns the custom package, along with the carrier and service:  learn more here
3. Add a Shipping Rule with a THEN action that assigns the Saved Selection (and package) whenever specific criteria are met: _ learn more here_

If you would like more assistance with this, please reach out to our Customer Success team via the links in top left of the app.