That is really hard, I know I would get sick of my kids wanting to take stuff all the time.

At my son's school they have a designated show and tell day, and on that day they have a topic to talk about, quite often the topic relates to things going on in the classroom, like science, animals, movement etc.
It makes life a bit easier as it isn't the constant going through the toy box to try and find someting.

What is the schools policy? Or is it more that they don't have one, I would have thought it would be time consuming to go through everyones show and tell everyday.