When I was younger, I worked in several bars and restaurants, and also had friends who worked in bars and restaurants. I was wondering if the following types of situations should be considered mortal sins:
A restaurant employee sometimes has the cook make her a free meal at the end of her shift, rather than paying for her meal, in violation of company rules.
A restaurant or bar employee gives free food and/or drinks to friends who come in, in violation of company rules.
Someone goes to a bar/restaurant where their friend works and the friend gives them free food/drinks. This person knows that their friend is breaking the rules by letting them eat/drink for free but happily accepts whatever they get for free and doesn't insist on paying.
Someone leaves a restaurant one time without paying their bill for a very small item, such as a sandwich.
A waitress allows careless customers to tip her twice, or to pay extra for their bill - she could alert them to their mistake, but decides just to pocket the extra money.
In none of these cases is the amount of free drinks/food large enough to cause serious damage to the restaurant. It is doubtful that any extra money that the waitress pocketed in example 5 was enough to put anyone in serious financial difficulty, although of course she can't be sure as she didn't know the financial situations of the customers.
I hadn't thought about any of this in a long time, but it came to my mind recently and I started wondering if these things need to be brought up in Confession. These sins go back to several years ago and are not anything that I would do now, so if they are only venial, I would not bother confessing them. (I have enough current venial sins to confess if I wish to!!)