Cushion cover closest to the body of Ralph Bamber, must have fallen from the overturned wooden chair at a time when the police toppled over his body from its original position behind the internal door, and prior to the police re positioning his body so that his head was resting in the coal bucket?
Other two cushion covers, could not possibly have fallen into the position they ended up in, if they were tipped off the other wooden chairs, or stools, because the chairs are facing in the opposite direction away from the position of the coal bucket and the two stools are too far away from the coal bucket - hence somebody picked these up and moved them into the position they ended up being photographed in?
Lets also not forget that according to some police sources, two stools were knocked over, and re-positioned by members of the raid team as they forced their way into the kitchen - if true, why would those two cushion covers have been on the floor next to the coal bucket, before the police officers knocked over and re-positioned those two wooden stools?