A box (1) is made according to the method, including a box body (1a) defined by a bottom wall (2), several side wall (3, 4), and several angles (4a) delimited by adjacent side walls; and angular elements (5) arranged at an angle (4a). The method includes a step of folding a flat blank (16) displaying a central panel (2') which defines the bottom wall (2), at least one first side panel (4') which includes an appendix (6), and two second side panels (3'); in the step of folding, the side panels are folded to define the side walls; the appendix is folded to define a corner of a angle of the box body and to overlap a second panel; and a step of fastening in which the angular element is fixed to the box body. The main feature of the method consists in that it includes a step of affixing in which the angular element is arranged on the flat blank; the step of affixing being essentially prior to the step of folding.