If the damages caused by a sin are corrected, does the sin need to be confessed?

Question:

I used my employer's equipment and electricity to mine cryptocurrency without their permission. I didn't realize the full implications of what I was doing until some time had passed. When it finally struck me that what I was doing was unequivocally theft, I immediately stopped.

My employer never realized (or suspected) that I was doing this, and the costs were not significant enough every month to be noticed. I work for a company with lots of monthly expenses, so my theft would have been difficult to find, even if they were searching for it. I paid them back for all the electricity I used mining and for all the electricity needed for cooling costs. I added quite a bit more (more than 20% by following the Old Testament model to ensure they benefitted financially from all of this). I was able to pay them back so that they didn't realize they were being reimbursed for anything. I did this by under-reporting my expenses (I purchased things for them as part of my normal course of employment and didn't list them on my expense reports).

I have confessed this to the Lord, begged for forgiveness, and have absolutely repented (the fact that I did this at all is wrecking me emotionally). I have also confessed to my wife (a fellow Christian) and will confess to another Christian in the next few days. However, I don't know if I must also confess to my employer (since they are unaware anything happened and benefitted financially from what I did).

I have waited to decide what to do until I could make sure the funds were repaid because I fear I would not be able to repay them if they fired me.

Is confession to the Lord, my spouse, and another fellow Christian (along with more than full restitution of the funds) sufficient?

Thank you for your help!