"Hasn't everyone noticed that the enhanced sachets are the only ones that glow just like the one from three years ago? Clearly, they were made by the same person."
"Illuminated embroidery, this is the first time I've heard of it and the first time I've had the fortune to see it. It's truly magical!"
"Everyone, look closely. Those seem to be not just a glowing hibiscus flower, but they also seem to have characters— I think I saw the character for 'fortune'."
"I saw the characters for 'peace' and 'health'."
"Why do I see two characters for 'longevity'?"
Put together, doesn't that spell 'May you have fortune, longevity, peace, and health'?
The extra 'longevity' character is precisely on the sachet the old man holds; presumably, the sachets embroidered with the other three characters are in the hands of those who bought Sorrow-Relieving Sachets three years ago.