First off, I just want to commend the developers behind Dayz. The game has seen alot of improvement and quality content since its release on PSN, that being said the exploit of duping is seriously pledging the official server's. I have multiple clips of people admitting(bragging) to duping and even been offered duped kits for money.

I'm no coder or anything but I thought maybe a possible fix could be that hight tier items could have a dedicated server number that is tied only to the server it spawns in and if the number is copied, then the pervious one could be deleted.
I also know you guys use to have admins that investigate reports of cheating back in ARMA 2 maybe you could implement this in Dayz.

I love this game and my duo have been playing ever since it's release on PSN but we can't ignore this issue any longer. Not only does it ruin the experience, but I'm also pretty it's actually hindering server performance and it makes us want to drop the game all together. You guys are great and I know if you really make this a priority, you can find a fix.