Hello Travis, nice images that were indeed created from the Goodwin glass plate negatives. Those negatives are still in the hobby today, I have the Matthews and I believe I know where the Boyd resides. Your photos were likely created, as stated earlier in this thread, during the early 20th century.
Here is scan of my negative with the colors inverted. The clarity of the negative is amazing and allows for a very high quality print/photo to be developed. Enjoy your cabinet!
I've written about this particular negative and many others
HERE.