The cache is not at the listed coordinates.
The poor Elephant is in pain! You will have to be his Proctologist and cure him of his condition.
Make your way to the "Elephant's Brown Eye" *. There are many ways to get there. One way you can get there is to park at the Parking lot at Silvemine Reservoir. (Entrance fee applies unless you have a Wild Card). Take the path towards the Elephant's Eye Cave. Pass Elephants Eye Cave. Keep going up the mountain towards Constantia Peak, over the Elephant's head and hump, towards the tower. When you come to a V below the road, take the left fork.
Generally follow the path at the top, not the road. There are short stretches you have to walk on the road, watch for the cairns where the path leaves the road and continues on straight up.
You should come out on the corner of the tower enclosure. Follow the fence on straight towards the coords (on the Hout Bay side of the enclosure). Don't turn right back towards the Cape Flats.
After a while the path then takes a 90 turn to the left at S 34° 03.301 E 018° 23.160 (and heads down to "Sentinel View"). Again you must not turn and continue on parallel to the fence. The path is faint and very overgrown in the beginning. It needs a little pushing through the fynbos at first, but opens up later.
After 100m or so, you will wind around a low peak (With a Radar station on it) to get to the Elephant's "hindparts".
The coordinates will take you to the beginning of the Medical Examination.
Don your lab coat and rubber gloves and pass your diagnostic equipment (yourself with a torch) into the Elephant's anus. Follow it as it curves to the right. Your diagnostic equipment will show the main straight anal canal that narrows to a small sphincter at it's end. Pass through the sphincter into the Elephants rectum, the cavity beyond the anus.
This is a dark cavity and your diagnostic equipment will need a good illumination source. Look around the rectum (have a look up, towards the colon - quite an impressive cavity). As you enter through the sphincter into the dark rectum there is a low shelf on the right. The shelf leads to a sinus (a very narrow tract that leads back to the anus).
Climb onto the shelf and palpate (feel) the constipated rock-like Elephant stool to the back and right of the shelf. Details of further examination and the final diagnosis can be found here. No rock-like stools need to be moved. Just palpate well.
Good luck Doc! Hope you cure the miserable Elephant!
* Karen Watkins: Adventure Walks and Scrambles in the Cape Penninsula