Mystery Boxes and Keys -- Save keys?

[R24329765]

Mystery boxes cost keys to open, but how good are they? Should I just save my keys for later, since I only have a handful and they don't just grow 'em in the Farms.

I read the "how to get ahead" guide and it suggests holding on to "bounty" scrolls from these boxes (???).

[DeathRiver]

Bounty scrolls at earlier level provides you little experience compare to quests. Use them later can get you more gold and experience since the rewards from the scroll rises according to your level.

[dethmatic]

yup save them for later levels preferably 50 plus at that time you will be begging for the extra experience provided by the og bounties