a locking panel having a hinge line 64 the numeral 66 denotes a perforated hinge line running along the right hand fig1 ends of the shutter panels each shutter panel may accordingly be detached along line 66 and swung away from the plane of cover panel 50 the numeral 70 denotes a locking tab carried by locking panel 62 the locking tab 70 adapted to be received into slit 72 defined by the indicated three cut lines in central lid panel 10 the base of locking tab 70 is integral with locking panel 62 its two sides are cut through the paperboard as indicated by the solid lines while its tip is also cut through the paperboard and is colinear with perforated lines 66 fig1 shows the locking slit 72 located in central panel 10 an alternative location of slit 72 which uses less material for the blank 8 is shown at fig1 a there the locking slit is located on the indicia panel 26 and is denoted by 72a fig3 and 4 illustrate the carton formed from the blank of fig1 the glue portions 42 and 40 are respectively fixed as by gluing to side wall panels 34 and 36 similarly glue portions 44 and 46 are affixed to respectively side wall panels 34 and 36 similarly glue portions 22 and 24 are affixed as by adhesive to respectively side.