[null and void]

One of the unanswered questions of the epilog is whether they ever went back to recover the eye and give it a better burial,

The eye was taken as part of the selfsame adventure where the locket was recovered, and properly buried.

[JohnBovenmyer]

I meant a BETTER burial, as in finding the rest of Mad-Eye, going back to the spot Harry marked to get the eye and burying it all in a way worthy of, say Dobby.