The cache is very easy to find. You simply unscrew one of the boot studs on the statue and a inaudible alarm sounds (this drives all the dogs in the neighborhood crazy) which triggers a electronic switch in one of the metal gates nearby. This switch once activated , slowly opens the gate. At the position of maximum opening, the gate makes contact with a small copper metal plate that itself triggers the cache mechanism open for exactly 35.76 seconds. To help you find the cache there is a electronic signboard that points you in the right direction. Once around a certain obstacle (you'll see which one) look for the green light emanating from the cache interior. All that is left to do is retrieve the logbook, sign it and return it before the cache closes itself again.