Incomplete Detectives

APTX 4869 is a pun on "Sherlock Holmes". 4869 can also be pronounced "Shi-Ya-Ro-Ku", which translates into Sherlock. Adding to the pun, the password for the APTX data is "Shellingford", an unintentional misspelling of "Sherrinford", which was the name Arthur Conan Doyle called his detective character before deciding on "Sherlock". The password and the pun name seem to be related to why several members of the Black Organization call APTX 4869 the "incomplete detective", implying APTX 4869 is not finished yet.