On May 6,2021 I sent a query to NPS Antietam regarding the gardner photograph

On May 8, 2021 I received an answear:
"I cannot definitively provide a location for you. In almost every location, Mr. Frassanito has been correct in his analysis. Without a clearly defined building or feature that is recognizable in the image it is impossible to say with 100% certainty.

Keith Snyder
Park Ranger
Chief of Resource Education & Visitor Services
Antietam National Battlefield
301-432-5124 / 432-7678
On duty Tuesday-Saturday
The Bloodiest Day in American History -- Hope for Freedom"

In other words...Not proven....{my words}