Well, just to stir the pot: came across one that's coming up for auction in NSW soon [couple of weeks]. What looks to be a very nice Army & Navy 12 bore, cased, but looks like no mould. Auctioneeers estimate AU$4.5-5k plus etceteras.

It's with Aust. Antique Arms Auctions; you can download the catalogue here PDF, ca 1.2 Mb; this link will work, unlike that from their webpage.
Lot 320, p. 19; pic is top of p.14.