Okay, so I've noticed Jacien's list from last year to be correct, except for the regular Archon eggs. I haven't tried in La Noscea, but neither of the spots in Thanalan or the Black Shroud had Shuffling Spriggans.

I ended up getting the "wild card" egg for that ring, but if anyone has info on where the Shuffling Spriggans are now, it'd be useful to have.