Back in 'Ye Olden Dayes'
Why should DoJ, Feds, Police etc require companies to keep records of communications when back in the olden times (1980's and earlier) this was conducted on paper stuffed in packets and sent via a man called Geoff with no records unless you used carbon paper between 2 pieces of paper..........
Going further back business was done in person with only a secretary to keep 'minutes' and the secretary could be instructed don't write this next bit......
And the bad guys won't comply anyway......... c..f. various politicians....