Did waaaaaaay to much research on this, better have been worth it..

Proof Below:

First Owner:

http://www.tf2outpost.com/trade/18954710 - Sold for $180 USD, about 4.8 in Earbuds

As for the next owner. This was hard to figure out since I had to check the history of most of the items I saw, In the end I saw, he spent 5 Buds on which are proved right here:

http://backpack.tf/item/99475558 1 Bud, guy who bought it is in the history and the guy he bought the noble from is right after him, which shows he used it to pay for the Noble

http://backpack.tf/item/94001628 Same as above

http://backpack.tf/item/97097187 Same...

http://backpack.tf/item/93174535 well....

http://backpack.tf/item/93101806 you get the point..

http://backpack.tf/item/276853849 by now..

So this means he spent 5 buds pure on this, so there is our proof for the 2nd owner giving us the high value.

Finally, the last piece of proof for the 3rd Owner.

http://backpack.tf/item/2075542336 He unboxed it and never sold it so it's safe to price it off of the two most recent sales (for the momment.)