Who is to say they were not bulldozed into the ground . Why bury something when you could just burn it ? They could be digging up little bits of scrap.
Seems people here are thinking that there is complete airframes to be discovered ? Why wouldn't the British have flown them out , besides a lack of fuel?
On another note there is a nice spitfire in the Bangkok museum rotting away :-(
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Edit :
Burmese treasure: 'We've done some pretty silly things but the silliest was burying the Spitfires'
Seems there crated . Just checking if this story was released 1st April