If you give a little boy his own tool box, he is going to want to use it.
When he starts to use it, he is going to need things to use the tools on, including the screwdrivers.
To use the screwdriver, he will need to unscrew screws.
When he unscrews screws, they will fall out.
When they fall out, they will get lost.
After they get lost, you will continue to find them, even on the kitchen table, and not know which injured appliance or toy they go to.
But you will find them
and find them
and find them.