Unusual Japanese Edo period lacquer box

A Japanese Edo period lacquer box, late 18th/early 19th century black lacquer box of unusual triangular form, the lid decorated with birds, branches, lattice work, and calligraphic symbols, the longest side with 3 birds and branches, one of the shorter sides also with 3 birds and branches, the other with branches, a cat, and a butterfly, the base with swirls, and the interior in plain red lacquer, 

Measurements:
Length: 21.5cm (8.5in)
Depth: 11cm (4.3in)
Height: 5.4cm (2.1in)

Condition: The decoration is worn and faint. There are small knocks to the corners and hairlines to the base. There are 3 cracks to the interior of the base (please see images).