Board Thread:Warhammer 40k General Discussion/@comment-91.224.27.226-20131031140001/@comment-6078851-20131126005713

in regards to the expunging of records: both legions were disbanded/dispersed/destroyed (possibly liquidated like the thunder warriors) before the end of the great crusade, and the records of such existed up until the age of apostasy where someone probably thought "no-one needs to, or should, know about what happened there, like ever (what with the chaotic corruption of astartes being bad enough), so lets just delete those files."

hey presto, records expunged during the age of apostasy.