You can receive a Key only if you already have a matching Coffer. Just a hint.
Oh really don't you see ?
Sometimes you'll get equipments, most of the time you get coffers and keys (that don't match) so you have to buy the keys to open the coffers and you end up with useless keys...
Moreover, this feature's aim is to entice players to play persians = to kill their troops = to revive them = to spend drachmas. Plarium probably noticed that most players had abandonned persians cuz they're crap unless you are a coiner, so they needed something new here. Sure we can spend 5 years building lights and heavies to eventually get a fully geared general but who will be playing in 5 years ? This system would be nice if it wasn't for the coffer/key part. Like play persians > get some equipment > nothing more ; but they had to add some money grab, again.
Of course, we can always not play persians and not get any bonus, which will increase the gap between big persian players (coiners) and regular players. They use the same system on Nords we know how it ends...
