A thing you will need to know: Kelly’s birthday is August 6

This handsome fella arrived on November 6, all the way from South Africa!
Friend Kelly visited Botswana and South Africa. She sent her hello from the first place she found postcards: the airport in Gaborone. Her next quest was to find stamps and a mailbox, which she said would be in Cape Town.
Where has this postcard been for so many months?

Perhaps it’s because she put the stamp on upside down?
I can’t read the postmark other than the year.
Kelly had a great time in Botswana and South Africa. By the time I got the postcard, I had seen all her pictures.