Yes, I have found many non-plated coins, in fact, roughly 10%.
A full report will be published in at least one numismatic publication within the next few months. In the meantime, follow me on Twitter, or watch for #GreatQuarterStudy for little tidbits of my findings from time to time.
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BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.