Joanne,
I'm sorry to hear about your tools. I really believe in Karma. This thief will have to pay in one way or another. Things always seem to come back around.
If you are going to engrave your tools the best thing to engrave on them is your drivers license number and state. Any law enforcement officer can easily check the information and find you name and address. By only using the number there is no information that anyone can use for identity theft.
With as many people there are out of work we will be seeing more and more of these crimes of opportunity. We all need to be careful about protecting our property. Make sure that you lock your car doors, don't leave your purse or other items of valuable in view in your car. There are more and more window smash thefts that will be happening.
Keith