[mothered]

Do you think removing the From

This ^

Removing the sender's details Is the best option.  After all, It's the tracking number that will be registered (scanned) and used as the point of delivery.

If they don't give me a return label, I'm also thinking of just using dry ice with the slowest possible shipping method. Dropping it off right before close on Friday at a local post office that is closed on Saturdays.

Good thinking.

As you're aware, be sure to allow enough dry Ice for storage and transit.