Bag of Bones

This unassuming brown leather bag smells of grave dust and wet dirt, inside of it there Is a full sun bleached skeleton of a kobold. If an hour is taken by one person the skeleton can be reassembled. This time can be halved if two people are assembling it. Once reassembled it animates and acts as an unseen servant, except for that fact that it is a very visible skeleton. Who was this kobold?! What was their name?! Why are they bound to serve forever and who would do this to them?! The world may never know.