Must the factory owner be informed of the details of the money taken from the bank and warehouses, and the exact amounts, knowing that he has generally forgiven you after your repentance?

You have done well by repenting from breaching trust and wrongfully consuming another's wealth. The rightful owner has absolved you of it, so you are not obliged to inform him again about the details of the amounts you took, because he did not stipulate, for his forgiveness, the specification of the amount or the method by which it was taken. What he has relinquished from his right, he cannot reclaim, because what is relinquished does not return.