Candidly I'm still trying to figure out exactly which shuttle run these chips came from... and from that maybe reverse determine which iteration of caravel was most likely taped out on them. https://github.com/efabless/clear/blob/main/repreducability.md claims it uses "main as of june 26th" but that does not appear to align with any of the "successful" tapeouts I have been able to find on the efabless website.