Wondering if, mathematically, all artifacts are equally likely to be found? I assume that is the case, but it sure seems like an uneven distribution. In the past couple weeks I've gotten four Alloy Values. In the past year I think I've seen one Army Camp Boost, and no Bonus Money Boosts (a couple of passives I liked in the past but sacrificed to upgrades).

I guess I am just in an unlucky stretch, where virtually all the artifacts I am seeing are either duplicates of good ones I already have at higher levels, or garbage ones. But it prompts the question if, at least in principle, they are all equally likely to be found?

Random number generator is random?

I once rolled a character in Call of Cthulhu on a 4d6 drop the lowest system, managed 2 18's and 2 17's on 6 stats.

TL;DR: if p = 1/6 and you want to know how large n needs to be 98% sure the dice is fair (to within 2%), n needs to be at least n ≥ 766

Yes, I feel it isn't random. I don't think I have dug 766 * (42/6) artifacts. I don't think that is the correct sample size but I have never record them all anyway.

It seems like there is a common table and a rare table or maybe the artifact of the day?

When digging is there any trick for getting an Epic out of the Epic/Poor digs?

No