Just think, you could dig them up and teach yourself a bit more about human anatomy, before trying your hand (pardon the pun) at Plastinating them, thereby preserving them in their then current state before burying them again, and then 'forget' to tell the next owners so that they get the fright of their lives when they do a bit of weeding...
The bodies arent in the house, so there is nothing really to fear.
Although, just imagine getting up in the middle of the night to get a glass of water or whatever and you see intruders in your back garden. Do you call the Police or get the shovel out and despatch 'The Skellingtons' back to their graves, making sure they actually ARE dead this time??
Actually, I guess you WOULD have to report Zombies to the Police, wouldn't you?? I would suggest reporting them to the local council, but seeing as half of them seem to be dead anyway I doubt anyone would really notice!!
We found a kids tricycle in the garden when we first developed it, so maybe a young kid died in our back garden.
Or maybe the parents just disposed of it!
...... Was the chain slack??