Trying one's best to return stolen items to the rightful owner

Q: A few years ago, I stole items from a persons car whilst we were on holiday at a certain resort for the fun of it. I am currently trying to right all my wrongs so my question is, what should I do with this item which I have stolen as it does hold some value of say approximately R500 and it is impossible to track who the owner of it is and return it to them.

Marital problem

Q: I'm really struggling. I need some answers. I got married when I was 18 and I am 24 now. My husband is from Pakistan. I'm from England and we have never had a sexual relationship and even though I'm married I'm still a virgin. I don't talk to my husband and he doesn't talk to me. Is my marriage nullified?

Passing a video camera or a sandwich to a non-Muslim

Q:

1. Non-Muslim boss asks Muslim employee in an accounting firm to bring him a sandwich that contains haram meat. Would this be permissible for the Muslim
employee to carry out as a favour? Or will this be counted as aiding in sin?

2. Non-Muslim boss asks Muslim employee to bring him a video camera. It is known that he will be using to make videos of people, moreover he would use
that to video chat with non-mahram women. Would this be permissible for the Muslim employee to carry out?

There is confusion because these acts are forbidden for Muslims, however the non-Muslim boss does not follow laws of Shariah. Also the employee will not be receiving any extra compensation for carrying out these acts, just the normal salary he is paid monthly. Please also give the general ruling for aiding non-Muslims in doing something that is not permissible for a Muslim.