Oops sorry for the delay. Only appraisal, since the would be buyer retracted (he was from England and feared problems at the border inspection)
No, I have never done anything like that. Starting many years ago, you could buy the contents of a storage space at auction. I have never felt the desire to do that either. Even if I had the means to get to such an auction, and the means to transport all that stuff, spending all that money without knowing what I am buying is seriously unappealing,
The videos I’ve seen of people unpackaging lots of abandoned mail strongly suggest that the most value comes out of making YouTube content as the purchased stuff itself is complete trash. Not even semi-useful trash like “Hey, a nonstick spatula” but more like “Oh, an anime case for a C-tier cellphone they stopped making in 2017. Also, it’s weirdly sticky because the rubber is breaking down…”