Bury
Right click the link to the sample below, choose "Save target as ..." and save it with your other sounds.
Important - Two samples of the same sound are given below. The first one was editted by obscure means. It plays fine in MUSH but just about every other program hates it. I've left it available as you may prefer it to the new one (which sounds slightly different). The second sound was editted by more conventional means and should work in anything. You don't need both.
Here's a sound for when you bury bodies. It only works outside as doing it inside does not count as a burial, it is described as tidying up. Probably won't work for religious burial ceremonies (as used by Priests) as those are a bit more elaborate than a shovel and a hole. This doesn't matter as the sound would be inappropriate for the religious burials.
The sound also works for burying items. I have now added a second trigger so that you also hear it when other players bury bodies in your location. Handy when grouped.
Follow the same pattern as door sounds to set this up (you have done the tutorial haven't you?) or cut and paste one of your existing door sound triggers and just modify the trigger and the sample.