Carbon Hunter: This is ALWAYS a horrible thing to do - archiving a cache.
Unfortunately with excessive rain in Johannesburg lately, the area under the bridge washed away and took the cache container with it. This "small stream" became a big torrent and the cache has washed into the nearby lake.
A zoo-keeper - and fellow cacher will keep a lookout for evidence of the cache. But I am sorry to say that this cache is no more.
Sorry to coin owners - I feel for you.