Double inversion

Wapler Mica, through Drouot Paris, sells on 3 July 2015 a "Flemish School, ca. 1660" depiction of the daughters of Creops uncovering the child Erichthonius. It's a relatively large (54 by 66) oil on copper, estimated at 2,000 to 3,000 Euro.

The description is quite lengthy, and has a section I particulary like, compositorial origin: "Ce groupe reprend, dans un sens inversé, le groupe de personnages du tableau (Cuivre, 59 x 48 cm) de Willem van Herp passé en vente à Vienne, Dorotheum, le 17 octobre 2012, n° 774, reproduit en couleur." Or: the group [of figures to the left] reprises, in an inverted sense, the group of people on the painting (oil on copper, 59 by 48 cm) by Willem van Herp sold in Vienna, Dorotheum, 17 October 2012, #774, reproduced in colour"

This is correct, but rather irrelevant, as the van Herp (pictured) is an inversion of an older work by a much more famous artist, whose figure composition has been directly copied in the painting for sale here...

The original work has been cut down (presumably in the 18th century), only copies and fragments are left. The whole composition can be seen in the above copy (courtesy Artvalue.com).

One fragment of the original showing one of the figures is kept at the Allen Memorial Art Museum. It shows the brilliance of Rubens and the difference between most copies and the real deal.

The copy for sale is rather crudely painted, and looks more like a copy after a tapestry than a copy after a painting. It isn't worth the estimate though, even though the story behind it is remarkable enough.

UPDATE: unsold, again for sale on 14 November 2015 with a revised estimate of 800 to 1,200 Euro, which is a lot more reasonable.

UPDATE: unsold again, now for sale on 21 April 2016 with an upped estimate of 1,500 to 2,000 Euro! Still with the same problematic description though.

UPDATE: again unsold, now for sale on 3 October 2016 at Drouot Paris with an estimate again of 800 to 1,200 Euro, and no other changes. How many times will they try this one?