Where do people find old silverware and old coins in real life?

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I’ve been seeing a lot of FB Reels lately about shops buying old silverware and old coins, even some that go as far back as 1945 or earlier. What surprised me is that even just one genuine silver piece can already be turned into instant cash. I kind of get where these usually come from, like old households, inherited stuff, or items from well to do families that were later stored, sold, or just left behind. So it makes sense how they end up circulating again. But what really got me curious is how these things are still showing up today. It feels like they should be rare already, but they still seem pretty common in these buying shops. In my case, the old coins we have are mostly from the 1970s onward, so nothing really that old or made of silver like the ones I keep seeing online. I guess I’ve gotten interested in this “treasure hunting” idea and started wondering where people actually find these kinds of items cheaply in real life.