To start at the beginning, Shell Island (EM gauge, Cambrian pre tops) featured in the early incarnations of RMweb, now largely lost. It made outings to four exhibitions before retirement and boxing up. Since 2010 it has been contained in a chipboard box with a tight fitting screw down top. Recently I had cause to take it out and shoot a few photos. I was frankly surprised to see a fine layer of dust over the whole thing. My playroom is dusty, and I'll admit to putting far more effort into making things than housekeeping but I was still surprised at how invasive the dust had been. Fortunately a soft brush and hoover soon had the scenery looking clean.
Further photos on my blog here.
It does make me wonder how best to protect individual models and layouts from dust?