Infinite silver keys
(Disclaimer: It is possible to obtain infinite keys but some players have experienced lags and even crashes in game if you go over the programmed amount of 30 keys. To not experience this just do a limit of 30 silver keys.)
Start a mission where you know there is a silver key or more in the same region. I like to do the mission where you find the archaeologist again. I know there is two silver keys to dig in a region that goes with the quest. This area is Windmill Hill. Once you obtain the key(s) you must hero save the game. Exit the game and then reload to where you saved it. You will notice that you loaded to the region before the quest. Check your inventory and you will see you still have the keys you got on the quest. Start the quest again and you will be able to get the keys again! This is not a glitch or hack, programmers knew that some objects had to be interacted with such as The Graveyard path where you talk to the grave keeper or on Battle Jack of Blades kill him and his minions. They made all interactions restart at every failure but and this is proof that saving counts as a failure since you start before the mission and everything restarts. This may confuse you that you keep all obtained items but saving still saves the game so it's counts as a failure so items collected and mission restart.
Added by: shlumie Jul 17th 2012, ID#8138