I would gladly trade you one with ear flaps for that one. Dave

If you look at eBay "sold" items and not just asking price, "offer accepted", or ended without bids price, I'm not seeing them going for $80 at all. Asking prices appear to be $60-80 mimicking other's asking price with a few crazy outlyers. Actual sold prices are much less. Also, a buyer knows it will cost a pretty penny to ship this nowadays. It would appear the interest in this item is that it is unopened - not that it contains four of any one item. To open it would change the future value so it will likely remain that way. So you need to find a relatively local buyer who wants an unopened 1952 case of M9A1s to display. Based on that it may be worth more or less than the sum of the parts. I saw some that had actual bids that sold for $14 - $50ish some with cans, some without. Maybe you can find better data. JMO, Dave

Looks fine to me, I had one similar to it years ago. Certainly don't think anyone is faking these (yet) 

Sold on Ebay this morning in the wee small hours.  I went to bed too early!

The Quail made it to Australia - Your guy served on the USS Finch (AM-9) as of March 1942.   From Wiki:   Sunk by a Japanese bomb On 9 April 1942, while moored at the eastern point of Corregidor, Finch was damaged by the near miss of a Japanese bomb, her seams opening and fragments of the bomb piercing her hull. The entire crew landed safely, and Finch was abandoned to sink the next day, 10 April 1942. Many of the Finch's crew served during the siege of Corregidor, though her captain was evacuated to Australia via submarine. The survivors of Corregidor were the first prisoners to arrive at Cabanatuanprison camp where they endured harsh conditions as described by Finch survivor Vernon G. LaHeist in his memoir.[2] Many were later removed to camps in Japan, Taiwan, or China. Yeoman Pratt, held in three camps in Taiwan, was evacuated aboard the destroyer escort USS Finch, and was startled at seeing the name, thinking it had been named for his old vessel, but that ship was named in honor of Lt.(j.g.) Joseph W. Finch, who died aboard the USS Laffey during the battle of Guadalcanal.     Service with the Japanese Navy According to Japanese records[3] the Finch was salvaged and designated Patrol Boat No. 103 in April 1943. The PB-103 served as a convoy escort in the Philippines and Indochina. On 12 January 1945, off Cape Padaran in the South China Sea (11°10'N, 108°55'E), Finch was attacked and sunk by aircraft from the USS Lexington (CV-16), USS Hancock (CV-19) and USS Hornet (CV-12) which were part of Vice Admiral John S. McCain, Sr.'s Task Force 38 that had entered the South China Sea to raid Japanese shipping.[4] U.S., World War II Navy Muster Rolls, 1938-1949 - Ancestry.com.pdf

Welcome to the forum!

People seem to be bidding it up, but I can't find any examples that match this and it screams repro, but the back looks period and people are bidding it up.   Thoughts?   https://www.ebay.com/itm/267683064117?_trkparms=amclksrc%3DITM%26aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20211130125621%26meid%3D94818af382364a3586aad932f5d58917%26pid%3D101465%26rk%3D1%26rkt%3D4%26sd%3D267683064117%26itm%3D267683064117%26pmt%3D0%26noa%3D1%26pg%3D3817808&_trksid=p3817808.c101465.m3507

Greetings fellow collectors,   I am a small business owner in the Midwest. I love all things militaria, but in particular WWII and aviation... Oh yea, and guns.   I love building scale models as well even though I don't have the attention span to finish anything.   I have a modest collection of wings, patches, maps, and firearms.   Looking forward to learning more and contributing to the forum!

Charles K. Duncan served as Chief of Naval Personnel from April 5, 1968 to August 21, 1970.  The chief of naval personnel oversees the Bureau of Naval Personnel (BUPERS).  https://en.wikipedia.org/wiki/Chief_of_Naval_Personnel   I love that we can put a 1968-1970 date range on the buckle.