Is this a WWII Shotgun Shell Pouch? - FIELD & PERSONAL GEAR

I've been offered this rig and was wondering if this is a shotgun shell pouch. There are the only two photos I have. Also, what is the value of a set like this?

Long Guns: Shotgun Shell Pouches - SWAT Survival, Weapons

US WWII 12GA Khaki Shotgun Shell Pouch, Ammunition & Magazine Pouches - Canada

Ammo pouch hi-res stock photography and images - Alamy

shotgun m1897 in ww2 and equipment - FIELD & PERSONAL GEAR SECTION - U.S. Militaria Forum

Lewis gun - Wikipedia

US Vietnam Canvas Shotgun Shell Ammunition Pouch

US WW2 Canvas Shotgun Shell Ammunition Pouch-d OD 1944 - Canada

Ammunition Pouches (American), The United World War II Wiki

What were those backpacks with folded blankets called (as seen used by the German army during WW1 and the USMC during WW2)? - Quora

U.S. Military T3 Gear Ammo Pouch