9/10 times, Reciprocal runes give absolutely nothing aside from crappy blue stuff. My friend and I have been farming CoO for a ridiculous amount of time today, and he has burned through every single reciprocal rune he had. In that time, he received exactly one stolen rune, and that rune gave him basically nothing either.
There needs to be a more reliable way to gain Antiquated runes. He doesn't have the calcified fragment for this week's tier 3 yet, and it doesn't look like he's going to get it as RNG has been nothing but crap for him all day.
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Antiquated Runes were never my problem. They drop all the time in the raid chests. I had quite a stockpile at one point. It's the Stolen Runes I could never get. I still have a character missing one of those fragments and I basically just gave up on it. The solution, by the way, is to go and buy the runes from Eris in the tower. I think she wants Hadium Flakes or something like that.