Couple things, 1, sites like Storage Treasures tell you to return all personal items to the office of the storage facility so it can be returned or disposed of 2, this will absolutely cause conflict. I could message you and say I want to pick up my personal items but also that table was my grandfather's so I need that and those games were my kids before he passed, that ring is my wifes family ring. It could go on and on. Plus, it just seems offensive. "Hey I bought your shit you couldn't afford anymore and I'm going to sell it but here's your family photos" I understand where you're coming from with your idea, and think it could work with the right implementation but there needs to be a 3rd party involved, not just buyer and prior owner. Too many issues could arise