This box was design for telescopic rod (alias ... Steel Appearing Cane Pocket Magician Staff Magic Stage Trick Gimmick Wand Telescopic Rod Metal Staff Stage Prop Toy), which you can buy on aliexpress or anywhere else.

Inner diameter is 70x40x25mm with 5mm radius in corners and rabbet on the edge.

For assembly you will need 8x M3x15 screws.

There is two version with screws from inside (on photo) or outside (V2).