One of the reasons that Chelsea’s Premier League case took so long, and that the punishment has been so light, is because the club voluntarily gave “thousands upon thousands of documents” to the competition. That took a long time to go through, and ensured information came to light that officials would never have known about.
Hence Chelsea only receiving a suspended first-team transfer ban, a nine-month ban on academy signings and a £10.75m fine, for secret payments to players and unlicensed agents in transfers between 2011 and 2018.