The envelope is the usual from the Monaco Royals. Although this features no monogram. The postmark says, in French, "Women’s Rights Committee, the Prince’s Government, Promotion and Protection." The Monaco Post Service has lovely postmarks. They usually rotate every week between a special postmark for an event and their standard postmarks. This postmark would have been stamped on all the mail sent in Monaco at that time.
This isn't surprising since the same thing happened last time I moved. Some monarchies note the address change right away, others take a while. My strategy has just been to include in green "New Address" on my envelope.
Inside is a flat card, with a printed message. The card features a black border for mourning.
The card translates to:
TSH The Prince and Princess of Monaco
and their children
Mr. Jean-Léonard Taubert de Massey and his son
Miss Mélanie-Antoinette de Massy de Lusignan
Baron Christian de Massy
Mrs. Leticia de Massy and her children
Mr. Brice Gelable de Massy
Mr and Mrs. Sébastien Knecht de Massy and their children
HRH The Princess of Hanover, her children and grandchildren
HSH Princess Stéphanie of Monaco and her children
The Noghes family and the Polignac family
Deeply touched by the kind attention that you showed them following the passing of
Mrs Elizabeth-Ann de Massy
They express their feelings of deep gratitude
The people listed on the card are Elizabeth's family. Prince Albert, Princess Charlene and their children are listed first, and then the rest are listed based on their relationship to Elizabeth.
Children:
Mr. Jean-Léonard Taubert de Massey
Miss Mélanie-Antoinette de Massy de Lusignan
Siblings:
Baron Christian de Massy
Nieces & Nephews:
Mrs. Leticia de Massy
Mr. Brice Gelable de Massy
Mr. Sébastien Knecht de Massy
Cousins:
Prince Albert, Princess Charlene, Princess Stephanie, Princess Caroline
Extended Family:
Noghès Family
Polignac Family
---
This reply came fairly quickly, just over a month since I wrote.
Each monarchy is making their own decisions about how to handle mail during the pandemic. But in general, things have been slower than usual. This is my first reply in over a month.
I would be prepared for long response times.