That leaves an electronic trail.
First, go to a public library and try to find a paper book on gold smelting, to learn the technique. If you can't find it there, go to a book store and buy the book for cash.
Then try to buy the tools you need, for cash. Preferably piece by piece, in different stores.
That still leave the problem of where to melt the gold, at least for those of us who live in multi-unit buildings, with no private garage or basement.
Too bad this happened in England. In this country, a person could take up handloading with cast bullets. A melting pot and some bullet molds wouldn’t cost much, and there’d be no need to mention gold at all.