You might want to have these examined to be sure they are not glass plate "copy negatives". The original negatives would most likely not have the Goodwin and Co. copyright on them (unless they are etched into the negatives you have or painted on) and the bottom corners appear to have stickers that are present in the image. It is impossible to tell without holding them in person, but my hunch is that these are not the "originals" but glass plates made after the fact from the developed photographs, probably about 1910-1920.
Awesome items either way, but a bit more research might help you guys when selling these so that they are described accurately.
Best of luck with the sale.
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