Your search for "diagonal box" revealed the following:

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Sheet, diagonal plaid 175 x 300 x 0.5 mm: PLASTRACT PLASTIC N (1:160) 91681

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Wall / Fence - Diagonal masonry pattern : Popopro N(1:150) MS-006

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Daiso Case Layout "Along Keihan Line" : Yoshiaki Ishikawa, Diorama art work 1:150

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Daiso Case Layout "Keihan Line B" : Yoshiaki Ishikawa, Diorama art work 1:150

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Echizen Railway] N Scale Small Layout : Yoshiaki Nishimura 1:150

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Diorama Hyotan - Emerald Valley : Hyotan Sumijiro - diorama art work non-scale

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Wall, Fence, Stone Diagonal Pattern: Popopro Painted Finish HO (1:80) MS-0106

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Art Frame "Spring" : Sucottu Gurei Non-Scale Diorama