Disgraceful?
What if they didn't have adequate ridership numbers to use to reconcile? A lot of bus cash fares don't keep a rider number. And it was 1981.
They did; the article even points out that there were two audits that showed the discrepancies:
> The failure to catch him, despite discrepancies between fares and cash raised in two audits, was put down to a belief that the errors were software glitches and, after his arrest, led to a significant amount of internal finger-pointing.