Complaint Review: Bishop and Miller Auctioneers

2 Picasso's Drawings were brought for sale to Christie's London in
Feb, 2016, one of them was assigned a lot #292.  Both owners claimed that their drawing was
featured in a book by H.Asmodi, Pablo Picasso, Ballettzeichnungen,
Feldafing 1956.  The sale was cancelled because obviously one of them
is a forgery.
The Picasso Foundation was called-in to examine both of them.
The first drawing had no gallery receipts (lot#292) and was smaller in size.
The second drawing had a receipt from a gallery in Zurich.  The first
drawing lot #292was declared unauthentic, fake Picasso by Picasso Foundation.
The drawing with the gallery receipts was declared authentic and
placed for sale as ot #176, June 23  2016, London:
http://www.christies.com/lotfinder/drawings-watercolors/pablo-picasso-deux-danseuses-6008966-details.aspx?from=searchresults&intObjectID=6008966&sid=0dda5ceb-a5e4-4328-8128-70273ff6b91f

The first, the fake Picasso was then placed to a different auction
house called Bishop and Miller Auctioneers.  They were contacted by
Christie's London who told them that they are about to sale a known
forgery of Picasso,  but Bishop and Miller ignored their outrage.
They place it for sale withholding the whole truth about it.  Sold it
as lot#600 on their September, 2016 sale.
To this day they have not refunded the buyer and claim that they did nothing wrong