Besides respecting the integrity of a c/o's hide to keep it from being taken by muggles here's another good reason to teach how to Re-hide a cache:
Cache's are supposed to be discrete hidden secrets. Plainly visible they can scare people who don't know what they are. We need good press not this kind.
We need to go back to what 'geo-sticks' was... a subtle arrangement of natural debris that a passing muggle wouldn't give a second glance to vs the unnatural parallel mis-matched species that screams something is 'going on' it's become.
My heart goes out to the 12 yr old newbie for his inadvertent bomb scare. And all the people worried and inconvenienced needlessly.
And here's an interesting link on bad placements: