I like these upgraded chests, especially the Sapphire and Legendary ones. Can be very useful for many

I also find creative using the Arcane Eye texture for the Sapphire Chest when you hide the eye with the chest so that it looks like a new texture, I somehow didn’t even understood right away.
Here are a few things to consider:
The static rays could be billboarded and locked to Z axis thus always face the camera without any need to make X-crossed rays.
Seems like the glowing layers are not attached to the main bones of the chests so that their scaling is not synchronized during the 'Birth' making the chests glitch through.
Although the chests' lids are not fully covered by the glowing layer and it's invisible from above, the locks are almost not covered and reveal a glitch.
There's a way to use in-game textures for the Legendary Chest if provided that you use geoset with miltiple faces, in this way it will be possible to wrap the texture of the runes almost beyond recognition, creating a good variety of patterns.
I hope that my quibbles might be helpful, otherwise just ignore them