mindseye: Well... here's how I see things.
This cache disappeared due to one of three core possibilities.
1) Death by muggle.
2) Death by rogue geocacher.
3) Death by landscaper.
Option 3 is unlikely, since this cache has lasted a couple years without disappearing.
If it was a muggle, they will likely be back to see if this gets replaced so they can get their hands on more shiny toys... and then history will likely repeat itself.
If it was by a rogue geocacher, they probably weren't aiming for the Jeep travelbug... or else they could have taken it and been on their way without removing the whole cache. The likely motive in this case would be to eliminate the cache itself; if so, they will likewise be back should this get replaced... and then history will likely repeat itself.
Occam's Razor strongly suggests this cache will disappear should it be replaced. Therefore, it shall not be replaced... unless someone else wishes to deploy their own geocache this park.
I'll open the opportunity for someone to do so, if they desire.
Admin: please archive this cache.