Thanks for the idea, but unfortunately it is quite an old one. Think about it... After a few weeks gem boxes start showing up, someone is bound to see an abandoned base with one, and think it a waste, and wants to take it. Then a percentage of those people get the idea to post the idea here.
Fast forward a year or two, and we still have newbies independently coming up with the same idea.
Basicly those gems are thiers, those obstacles that can generate gems are thiers as well, and your stuff is for you. It would cause a frenzy as people will just hunt and raid bases with lootable gem boxes, when gem purchases are Supercell's sources of income. If the avaliblity of gems to players change, especially if based on those obsessive enough to look for gems, that would just ruin things in general.
It is just one of many ideas that seem good at first, but aren't.
I know the search feature isn't exactly Google (but could use Google to search here if you know how), but if you are new, and have an idea, 95% of the time it has already been thought of here, or a version of it has. So give things a search first, and you'll likely get your question answered... which might not be how you'd expect it to be answered.
Anyway, good luck, and don't feel bad. I even thought it was a good idea when I first joined here.
