IMO, the Noss bars were recovered from the Caballos. He used the bars to establish his Victorio Peak story so that he could divert attention away from the Caballos, and later used the Victorio Peak "cave in" scam as a ruse to bilk investors. Later, IMO, your government used Victorio Peak and the Noss story to launder WWII stolen gold from Europe. Nice and tidy.
The only documented proof (other than circumstantial evidence surrounding Willie Doughtit's activities) re the existence of the Noss bars are his 1939 assays from Hawley & Hawley, Douglas AZ, that were provided on pages 131-132 in the Gold House, The Discovery - a book that also includes testimony from his associates that firmly establishes his Victorio Peak ventures were a scam. Noss was a lifelong grifter, you know. Charlie Ryan finally ended his Victorio Peak shenanigans in 1948.
These assays established that the Noss bars were primarily copper, about 70% (+/-), which accounted for their dark patina. The bars also contained 140 ounces/ton (+/-) of gold and 90 ounces/ton silver (+/-). Interestingly, it's a fact that those values are strikingly similar to the reported gold-rich near surface copper ores recovered by the 18th Century Spanish from the Santa Rita del Cobre mine 50 miles west of the Caballos. How this bullion might have been moved from Santa Rita to the Caballos is unknown, but I for one do not believe in coincidences.