He mentioned casks as well, same as the "trade axes" (hatchets) that were shipped across the Atlantic as heads in barrels, the Basque region being one of the places supplying them. It looks like Sheffield did the same with knife blades.
The guy didn't seem all that knowledgeable on the subject, but fine if guns are his thing...
"Old Hickory" still make (I think?) a line of carbon kitchen / butchers knives, for anyone fancying a "trade knife" it's pretty close short of a real hand forged blade. A couple below I've had a few years, using in my kitchen (ignore the hatchets).
I've a soft spot for old carbon kitchen knives & have found a few nice ones at boot sales over the years, they remind me of images I've seen of Frontier / Trade knives.
Below are "Sabatier's", they actually turned out loads of carbon knives from the French region until very recently.
Above is after they were initially cleaned, they discolour with use, I do use them even though it's not really practical since Sheffield invented that new fangled "stain less steel", but I enjoy seeing the various colours that form from different foods and looking after them.