Based on the two perfectly matched halves would complete the top of Ana's jewel box:
xxxxxxxxxx
xooooooox 1 side of top
xxxxxxxxxx
-------------- hinge
xxxxxxxxxx
xooooooox
xooooooox bottom of box
xooooooox
xooooooox
xooooooox
xxxxxxxxxx
-------------- hinge
xxxxxxxxxx
xooooooox 2nd side of top
xxxxxxxxxx

the o is a place holder ignore them
__________________________________________________ ___________5 TO A SIDE based in a round clock face:


----------11===1
--------10=====2
------9========3
---------8=====4
-----------7===5

the - and = signs are just place holders so ignore them

These are two other possible shapes for the the box that no-one has really considered.