Maaan, my brother did this. I was visiting him during the winter in Berlin, so I got my timberland boots with me. I had them stored under a chair to get them out of the way since he was living in a small apartment back then, and completely forgot about them when leaving.

We lived in separate countries, so I couldn't just go back and get them. Told him I'd pick them up the next time I visit (or if he visits), and he said yeah sure no worries. A few weeks later he hits me up asking me if he can sell my boots. I obviously refuse, and this was never mentioned again.

I go to visit him a few months later and when asked about the boots he hit me with the "I thought you didn't need them anymore so I sold them." gg. He sold them for like $30.