*To find this you will have to track down the diamond thief by following their trail in the "Robbery in the Butts" Advenure Lab cache*
"Hey Rookie, that was some great work out there in the field! With all the evidence you've gathered you should now be able to work out who the dastardly criminal is who stole Lady Butt's diamonds. Here's a line up of the most likely suspects in Brentford, all you have to do is tell us which one is the thief. So come on rookie, it's time to prove yourself. Which one is it?"
PS: There is no need for you to personally return the stolen items to Lady Butts, just make a log to let us know that you've found them and we'll have them safely collected.