Haselgrove Box - Jennifer Haselgrove by Geekium

This Packing puzzle is likely the first to use a blind sliding block type solve, I first encountered this when Eric made a small run.  This one is very nicely crafted by Geekium.

Here’s their description:

“A unique puzzle based on the locking mechanisms of the Egyptian Pyramids Your goal is to get the pcs out of the box. Once removed you may note that the largest pc looked at sideways on is in the shape of a "J" and when looked at from the top in the shape of an "H", the initials of its inventor Jennifer Haselgrove of Britain.”