Why Christmas cards arrived this summer?

Last week three Christmas cards arrived in my Cayman Brac post office box, two from within the Cayman Islands and one from the UK. While it’s always fun to get Christmas mail in the middle of summer, I’m very curious about where it’s been all this time. Are there deep dark corners of the postal service where whole sacks of mail go missing for six months? And should I be telling friends that if they want to send me a card this year, they should probably be mailing it about now?

Read Auntie’s answer and comment on CNS Local Life