Dealers give many reasons why they are failing to revel the collecting histories of the artefacts they trade in. Most of it is bla-bla, but a case going through the courts involving Russian potash billionaire Dmitry Rybolovlev the former owner of fertilizer business Uralkali sheds some light on the less salubrious among them. Blatant profiteering from a limited supply and boundless greed ('Russian billionaire buys Salvator Mundi, dealer makes $50 million killing' The History Blog April 5th, 2015). The case involves the alleged rediscovery of Leonardo da Vinci’s Salvator Mundi and its sale to Mr Rybolovlev's collection by Swiss businessman Yves Bouvier.
British archaeologist living and working in Warsaw, Poland. Since the early 1990s (or even longer) a primary interest has been research on artefact hunting and collecting and the market in portable antiquities in the international context and their effect on the archaeological record.
"coiney" - a term I use for private collector of dug up ancient coins, particularly a member of the Moneta-L forum or the ACCG
"heap-of-artefacts-on-a-table-collecting" the term rather speaks for itself, an accumulation of loose artefacts with no attempt to link each item with documented origins. Most often used to refer to metal detectorists (ice-cream tubs-full) and ancient coin collectors (Roman coins sold in aggregated bulk lots)
"tekkie" - metal detectorist/metal detecting (a form of artefact hunting)