Help Locate a WWI Italian Soldier's Grave in Austria

One of my Facebook friends is looking for help locating the grave of her Great Uncle, Palmieri Tavino.

Here's what Laurie knows about her Great Uncle:

Name: Palmieri Tavino, born in Montorsi (a small section or "frazione" of Sant'Angelo a Cupolo), near the city of Benevento, Italy. Province: Campania. 

He was educated and proabably was an officer. He was killed in action in the last days of the war, 1918. Buried in Austria. 

Father's name: Alfonso Tavino

Mother's maiden name: Maria Antonia DeMercurio

If you can help locate the gravesite or provide some helpful ideas, please leave your suggestions in the comments below.

Any thoughts on his rank in the military based on his uniform would be greatly appreciated.

Thanks!