WANTED: search / crosscheck database.

Hi, wondering if anyone knows of a plugin where you users can store a sequence of numbers into the database and other users can search the database to see if the number has been added. What I’m basically trying to do is create a private VIN-NUMBER database where users add their VIN number if their items been stolen and If someone has just bought a new item and want to check it’s not stolen they can check the database?

Thanks