Answered by Shaykh Muhammad ibn Adam al-Kawthari
In the name of Allah, Most Compassionate, Most Merciful,
Your regret and remorse on such errors in the past and your intention to make up for them is surely commendable. May Allah bless and assist you. However, be cautious in not becoming too paranoid about the whole situation.
If you are certain that you took wages for jobs which you did not carry out altogether, then that amount must be paid back. Merely not working with full concentration will not make the wages unlawful. Similarly, if you took paid sick leave without actually being sick, then that should also be paid back.
Therefore, all the wealth that you acquired in such a manner, meaning without actually carrying out the job or wrongfully taking paid sick leave, must be paid back to the owner/s of the company where you worked.
If you have doubts about your work, as you have stated in your question, then you may speak to the owners of the company and ask them to forgive you. If they are willing to forgive you for everything, then you don’t even need to pay anything back.
Thus, be cautious about this matter but at the same time avoid any unnecessary complications. If you are paying the money back, then make a precautionary estimation, pay it, and avoid further misgivings.
And Allah knows best
Darul Iftaa, Leicester, UK
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