Done nothing to feel too guilty about.
When I was about 20 I was once staying over at a friend's parents house. His sister was away so I was given her room. There were still some of her clothes in the wardrobe and drawers. I looked, but never tried them on for fear of being discovered (there was no lock on the door).
There was a large black bin bag full of clothes near the door.
The next day, I was putting my things in my car, getting ready to leave and my friend said that he would follow behind in his car as he had to take some things to the charity shop.
Guessing he meant the bag of clothes, I said "I'll save you a journey and drop it off for you"
Sure enough, the bag of clothes was loaded into my car. We said our goodbyes and I drove off.
Completely "forgot" about the charity shop until I got home, where I was able to take my pick of what was in the bag. It was all in very good condition, and a few items still had tags on, so had never been worn. The next day I took the rest of the clothes (and some of my own that I no longer wanted) to my local charity shop.
I remember there was a lovely blue dress with a white, real lace collar. I wore that dress until it was worn out. I loved it.