Focus on Metal Detecting: Where are these Artefacts Now?

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This is a photo of dreadful living room decor and heaps of metal detected artefacts from the "late 70's, early 80's". It shows US metal detectorist Archie Ray "with a few of his finds". The photo was recently posted on the Stout Standards anti-preservationist metal detecting blog of one Dick Stout who commented "Back then you had to have a photo like that taken. We all did". So if every metal detectorist in the late 1970s and 1980s had a comparable collection, and tens of thousands of metal detectorists since then have each been accumulating collections of similar sized for the last three decades, then it may be imagined the scale and rate at which the archaeological record is being eroded wherever this damaging hobby is practiced. As the older generation of artefact hunters pass away, where do all those finds end up? On ebay, in museums, or in a skip? Oddly enough I cannot see the big pile of notebooks or index cards or whatever Mr Ray would have needed to document the findspot of all those artefacts. Perhaps they are behind the photographer.