Did I say that the sale would be REPORTED?
No.
Read my response again. I said only that you're obligated, under the laws of the United States, to report the profit on such sales as taxable income. It's up to you to maintain the records on the commodity's basis, which you should have received in the form of a receipt when you purchased the stuff.
Whether you do or not is, of course, your choice.
That said, depending on the size of the sale and new laws that are in place, yes, you might very well find yourself the recipient of a form similar to a 1099-INT if you reach a certain threshold with a single dealer.