Is it obligatory to dispose of money earned from a job that involves statistics for the wine trade, knowing that this discovery was made late and that most of the working time is free time spent on permissible matters?

There is no sin upon you for what you mentioned, nor does it affect your salary. This is because your assistance to your colleague is not part of the work for which you are paid. Furthermore, you were not aware of the presence of alcohol among the items you were registering. There is no accountability except in deliberate intent, as Allah Almighty says: "And there is no blame upon you for that in which you have erred, but [there is blame for] what your hearts intended" (Quran 33:5). And as the Prophet, peace and blessings be upon him, said: "Indeed, Allah has pardoned for my Ummah their mistakes, their forgetfulness, and what they are forced to do."