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					Originally Posted by  Matt Stephenson
					 
				 
				 They appear to be grenade boxes, and look like they were painted white originally, with the stencil applied to the front, and felt attached to the inside of the lid. The stencil reads: "GRENADE - SMOKE & THERMITE" 
			
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 I agree with them coming from a US produced armoured vehicle; my guess is M3 Medium Tank or M3 Light Tank.
Hanno