How do I open the chest on the southeast corner of Tikarel Island?

I am confounded by how I am supposed to reach this chest. I managed to spawn it by hitting the (cleverly hidden off screen) archery target, but it landed on a spot that I cannot reach, as I am unable to climb this small half step ledge shown in the picture because video game logic. I am also unable to open it from an oblique angle, and pushing the crate is not getting me anywhere.

How do I acquire the contents of this box?

Go just on the cliff above, there is a crate (the same crate you pushed next to the chest I guess). Push the crate and make it fall, then jump on top of it. No need to touch the crate more, just leave it. A mere last jump will do the trick.