In DayZ it is too easy right now to hide a body. In the future I think you should need a shovel to bury a body. And the body needs to be on the ground to do it. Not concrete. And after you bury it will leave a pile of dirt behind so if someone comes across the pile of dirt they will be able to unbury the body and get the loot. This makes it not as easy to hide a body right away and as easily. it makes it more realistic too.