Just talked to someone at RSSC.

The mailing on December 28 will also have the number of nights they have on record for you including the ships and sailing dates. There will be forms in there to correct any errors you feel have been made on your nights and instructions on how to get that corrected.

There will also be a form to send in if you wish to correct the information for your mailing list.

They are sending out to society members who have sailed in the last five years.