DEAR AMY: We attended a wedding nine months ago and still have not received a thank you note for the generous gift we gave to the couple. This was a traditional three-day weekend affair that required travel, multiple outfits and, of course, a very nice wedding gift. The couple has offered multiple excuses for why they haven’t sent their thank yous (their wedding photos coming back, holiday cards, etc.) but … nothing. Adding to their excuses, every Wednesday they post a “Wedding Wednesday” flashback to social media where they share pictures, stories, hints and tips about curating the perfect we…