Silverfish eat starch: book bindings, wallpaper paste, cardboard, photographs, cotton and linen in storage. They want dark, humid and undisturbed, which describes the back of a wardrobe and a linen press in a house that sits closed up for half the year.
Coastal humidity makes this worse than it is inland, and a shut beach house with no ventilation through winter is close to ideal for them. Damage shows as ragged holes and grazed patches on paper, plus yellow staining and shed skins. Dust is the right tool, going into wall cavities, the roof void, behind architraves and into the wardrobe frame where it stays put for months. Ventilation helps as much as the treatment.