Eric, I haven't. My hope was that the folks who (first?) stated the information--from what I can tell, JTR on here and whoever wrote the entries for the Julia Auction catalog--might respond to describe where they found it.
My belief, at present, is that the story is entirely mistaken--due to a confusion of an earlier Nicholas Hawk (or Hawkes) with our gunsmith. In addition to the 1780 new report quoted above (too early for the gunsmith), there is a reference in Kenneth Scott's Counterfeiting in Colonial America about a Dutchman named "Hawkes" committed to jail in September 1749 for counterfeiting (pp. 74-75). This is much too early for our gunsmith. But I am guessing that the "fake news" about the gunsmith Nicholas Hawk stemmed from reports such as these, handled sloppily.
I am eager to learn more, though--and if there is truly information about Nicholas Hawk the gunsmith (1782-1844) in this regard, eager to hear it.
Scott