Tamper evident packing case

A self-erecting packing case formed from a single board blank, the packing case comprises first and second side walls 101a, 101b and first and second end walls 102a, 102b integrally connected together along respective parallel fold lines, a first-type base panel 104a integrally connected to a bottom end of each of the first and second side walls 101a, 101b along a respective fold line105a, 105b and, a second-type base panel 106a, 106b integrally connected to a bottom end of each of the first and second end walls 102a, 102b along a respective fold line107a, 107b wherein each first-type base panel 104a, 104b is glued to an adjacent second-type base panel 106a, 106b and comprises a fold line 108a, 108b along an edge of where the first-type base panel 104a, 104b is glued to the adjacent second-type base panel 106a, 106b and wherein each first‑type base panel 104a, 104b further comprises a lobed section 109a, 109b integrally connected along a fold line 110a, 110b, wherein the lobed sections 109a, 109b of each first-type base panel 104a, 104b are arranged to deflect and then interlock with each other when the packing case is erected from a collapsed condition, thereby to form the base of the packing case.