Collapsible metal box

A collapsible metal box, comprising:

• a. a base,
• b. two first and two second opposing side panels that are articulated to the base about horizontal geometric rotation axes, at least one of the first side panels comprising holding means for holding it in a position standing by itself on the base while the second side panels are folded out fully toward the outside, wherein the holding means comprise a joining element of which
• i. a lower part is temporarily inserted into the upper end of a corner upright of the base in order to hold the corresponding first side panel in the position standing by itself, and
• ii. an upper part is inserted into an opening at the lower end of a side upright of the first panel,
• wherein at least one of the first side panels, when it is held in the position standing by itself, is at an opening angle α, of greater than or equal to 95°, said angle being measured between a horizontal position of the first panel folded in toward the inside and the position standing by itself, the lower part of the joining element comprising a recess forming two flat sides, with one short side and one long side perpendicular thereto, the short side defining an angle of greater than 95° with the longitudinal axis of the joining element, the angle limiting the pivoting of the corner upright and corresponding to a maximum opening angle of the first panel when the latter holds itself in the position standing by itself.