Of course there are no buried planes. There is no reason whatsoever to bury a bunch of planes. Much more simple and economic to scrap them and sell the metal. Bury them is also a very bad method if you want to 'store' them.
Not quite true. At the end of the war there were several airports around the country that were selected for 'slagging,' or aircraft meltdown operations. In the end the only site that was used was Walnut Ridge, Arkansas. However, many, many fighter and bombers had been damaged through training operations (many totally destroyed of course) and could not be flown. Those airplanes were usually flat out dumped in an area of the airfield marked 'condemned' and those were buried. Obviously picked clean of anything useful beforehand.
If you know you have a training airfield in your home town or city, and you are able to get your hands on the outlying platte (airfield and surrounding plots) then you may find a 'condemned' area marked on the map. That's where these wrecks were buried.
Nothing worthy of 'treasure' though.