It says there are 17 images on that database for Benjamin Whittaker in 1867! I looked at one and it says Number 9841, age 20, offence: Felony, convicted Warwick Assizes 30 Nov 1867, sentence 5 PS (= 5 years penal servitude?), surgeon's report healthy, conduct good.
One of the images is his release on licence 30 Apr 1872:
https://search.findmypast.co.uk/reco...om3%2f01471611
and it says his conviction was for robbery with violence.
If you browse forwards from there, there is lots more information.