Gratitude?

I liked this story, and it just might give you an idea if you never hear back from gift recipients.

One Christmas, Mom decreed that she was no longer going to remind her children of their thank-you note duties. As a result, their grandmother, never received acknowledgments of the generous checks she had given.
The next year things were different, however.
"The children came over in person to thank me," the grandmother told a friend triumphantly.
"How wonderful!" the friend exclaimed. "What do you think caused the change in behavior?"
"Oh, that's easy," the grandmother replied. "This year I didn't sign the checks."