The game would be amazingly boring if you couldn't do quests on the app version, without them there really wouldn't be a point to having an app version at all, but as it's been said before, you're not losing much. Only possible prizes from the last two chests are really significant to any degree, and they're not even that great. I only bother with treasure hunt on my main world because I spend my time there....no reason to pass up free stuff, no matter how lame it is.