IME (and based on reading experiences of others) hotels pretty much universally handle reports of theft from rooms very poorly. The reaction tends to be circle the wagons and don't admit anything. Management not following up as promised seems to be pretty common. I had an incident with a camera at GH Kaui and this is exactly what happened. Whether they are taking steps internally to deal with the suspect(s) is a different issue, and something they're not likely to tell you.