if i were a buyer i would keep in mind that there are so few of these turn-of-the-century jeans around that they first-name them. fewer in anything close to wearable condition and as far as i know none that are unworn. if i were a buyer i would ask myself how it could possibly happen that niche workwear from that long ago has been archived as these appear to be. and if i didn't get a provenance from the seller or their representative that made 100% sense, i would walk. personally i wouldn't even approach a deal like this because it seems so likely to be a forgery. why? because money - the same reason folks forge artwork, jewelry, watches, or anything else that makes people suspend disbelief when common sense says to run.
but hey maybe it's one of the greatest americana finds of the last 30 or 40 years.