Small Bricks (Forest Wood LD8)

Found whilst digging in the garden. Can’t think what they were made for or a use for them!
13 x unused bricks just like the normal ones but only 70 W x 146 L x 43 H mm (2¾ x 5¾ x 1¾ “).
10 are normal square bricks but 3 have one corner rounded (see photo).

       
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