i dont no much about RT, but to find two artifacts you wanna find, is actually pretty hard...
so it could be just you got whats called, RT`ers Greed! its where a RT player gets greedy xD jokes
but yeh, its pot luck really... it helps if you dig in the special times (e.g rare time, common time exctra)... and also i`ve heard if your out of dp... and also luck artifacts effect digging... as well as loyalty (some people disagree) and also land size as well as type...
1land spaz is the BEST of the BEST!!! but your only get one, if you won 1 in a compo... :P
but the best digging plannet is, U-spaz, then Gas, then Ocean...
hope that helps, and just mark it with a correct awser if i helped you :P