Your search for "(corrugated) cardboard" revealed the following:

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Aluminium corrugated sheet 190 x 35 mm 7pcs: Campbell unpainted kit HO(1:87) 802

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Aluminium corrugated sheet 190 x 14 mm 10pcs: Campbell unpainted kit HO(1:87) 804

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Railway Track Team with Trolley : Takumi Diorama Craft House - Pre-Painted HO (1:80) 1016

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Ultra-thin aluminium sheet (0.2 mm thick) 10 cm wide and 50 cm long: Greenstuff World material GSWD19

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Toreiin : Tsumesho with Well - Corrugated Roof Type : Takumi Diorama Craft House - Finished product HO(1:80) 1037