"As I failed to answer every one of the sphinx’s riddles, I was unable to get past it to my gold."
-- letter from Mallory Twiddle (DP1)
Letter complaining about bank security from Mallory Twiddle, appearing on the Letters Page of the Daily Prophet (DP1).
Mr Twiddle was unable to access his High Security vault because of the difficult riddles asked by the Sphinx guarding it. He would personal prefer the return of dragons or security trolls to the front line at Gringott's Wizarding Bank (DP1)
While the date printed on DP1 is 31 July 1998, the timeframe for these events is 1992-1993.