paradisefarm2009; I understand the feeling of wanting to get back at the thieves, but boards with nails are really not a good idea for many reasons. The thieves would probably end up being the last people that stepped on them and even if they did, the OP could be sued for the dangerous conditions on her property as it would be COMPLETELY her fault. Please, nobody do this.
I wish I had an answer for the OP's problem. My advice would be to go ahead and live your life as you have the right to do and don't spend a lot of time planning to get back at your neighbors. You have no control over their bad behavior. You really don't. You aren't even certain who it was. If you feel like letting off steam, you might write a letter to the editor of your local newspaper. State what happened just like you did here and then state how you feel. I would leave out the word 'neighbor' and substitue the word 'thief'. Let them know that people are watching....
I wish I had an answer for the OP's problem. My advice would be to go ahead and live your life as you have the right to do and don't spend a lot of time planning to get back at your neighbors. You have no control over their bad behavior. You really don't. You aren't even certain who it was. If you feel like letting off steam, you might write a letter to the editor of your local newspaper. State what happened just like you did here and then state how you feel. I would leave out the word 'neighbor' and substitue the word 'thief'. Let them know that people are watching....