That's a good kit, looks just the right size for young kids to carry, and all the basics they need.

I know you've already handed these out, but you did say you'd already cut a face hole, and in the instructions you say "make a hole for your face" (Sorry - just spent the weekend validating data entry ...)

Another pointer to consider giving is to actively listen for searchers. It is possible to be so actively blowing your whistle (or shouting)that you exhaust yourself, so alternating whistle blasts (3 groups of 3 blasts if fairly standatd in this part of the world) with a longer period of listening (several minutes)is a good strategy.