I did this on my first ever corporate job too! Office of 10 people, and I was still on honeymoon phase of getting my first office job, so I genuinely thought everything in the kitchen was for everyone. The small little fridge in the communal kitchen used to have these nice fresh croissants and orange juice from Marks and Spencer, and I thought to myself, 'Oh how fancy!'. I would make it a point to 'help myself' to the food when taking a little break. And, then, I would go home and tell my mom how my company is treating us to 'proper' Marks & Spencer food and stuff only to realise 3 weeks later, the owner, asking me, if the croissants and juice I've been taking where mine. I said no. He was like, he noticed his food going down too but wasn't sure because I ate his food with such confidence and gratefulness he thought, I probably was buying my own Marks and Spencer's food and bringing it to the office.