"Flash" writes:

Your reward to them and your recognition of them should be PUBLIC.

Napoleon , it is said, once remarked that if he had enough ribbons and
medals he could conquer all the known world. Praise and recognition should
public, recriminations as privately as possible.

Good for the teen, good for your soul.

I disagree. A reward should be in whatever form most honors the
recipient. Having had a couple of children survive high school in
recent years, rewarding the finder privately is by far the better
option -- any public recognition is more likely to do harm than good.