The lightly raced Jewel Box can give local trainer Ricky Yiu Poon-fie something to smile about after what has been a wretched run. Generally his stable isn't firing, his star performer Fairy King Prawn has left for Ivan Allan's yard and jockey Steven King finishes tonight and leaves for Melbourne. Jewel Box, though, looks poised to strike form after a solid second in yesterday's first of three trials. Jewel Box's session was on the dirt and he was noted keeping on well to finish half a length behind Gary Ng Ting-keung's useful sprinter The Oscars. Jewel Box has caught the eye on a couple of starts already and yesterday's trial confirmed some much-improved work from him in the past fortnight. He should go close when next seen out. The other two trials were for griffins down the straight 1,000-metre chute. The opening heat went to Geoff Lane's good type Rebel Leader, who went firmly into the notebook making good late ground when trapped wide on debut. He made all yesterday to clock a promising 59.5 and should be competitive in upcoming griffin events. The Allan-trained Blessings' Partner took the second heat, again making all, but one second slower than Rebel Leader. It should pay to keep an eye on Par Avion, the third in this trial and also Allan's Pristine, who was sixth. In other work yesterday, Welshman David Harrison put Derby runner-up Housemaster through a solid 800-metre piece and thus looks set to partner him in Sunday's showpiece Gold Cup. Housemaster quickened well to come home in 22.2 for an overall half mile in 48.4. There was also a promising piece from Alex Wong Yu-on's Prospero, who is worth keeping in mind if he runs in Sunday's first division of the Class Four 1,400-metre handicap.