While perusing the terms and conditions, I cam across this additional benefit for Sea Rovers*, a Sea-Rover charm (upon request starting in 2023).
*Sea Rover: Those who have completed two full-fare (i.e. no free Access Key, or reduced fare) voyages on Scarlet Lady or Valiant Lady between January 1, 2022 - March 31, 2023 (inclusive).
If anyone has one, please share a pic!