Is there any writing on the back of the framed photo? I thought maybe there was because you knew the one photo was of Red Horse and the other called Burial Ground. But, perhaps, you researched the names...What are the measurements of the photos please?
I did find one limited edition photo (DF Barry) which sold for $49.95 in 2008 on Ebay. It explains how the negative plates were used by a modern photographer:
https://www.worthpoint.com/worthopedia/d-f-barry-wild-horse-plate-37-framed-pictureI'm not certain yet about the GW Reeves Collection, but can tell you that DF Barry's work is represented in selected permanent collections.
Smithsonian Institution, Washington DC
Library of Congress, Washington DC
North Dakota Historical Society, Bismarck, North Dakota
Custer Battlefield Museum, Custer National Historic Site, Montana
McCracken Research Library, Buffalo Bill Center of the West, Cody, Wyoming
D F Barry Collection of Photographs, Denver Public Library, Denver, Colorado
W. S. Hart County Museum, Newhall, California
National Archives and Records Administration, College Park, Maryland
Douglas County Historical Museum, Superior, Wisconsin
Museum of Wisconsin Art, West Bend, Wisconsin
However, The Denver Public Library owns Barry’s original negatives and his collection of prints. So, this might be the place to find more information pertaining to the GW Reeves Collection.
http://www.internetantiquegazette.com/photographica/2765_barry_df_david_frances_barry_american_photographer/