"Attributed to Erasmus Quellius II" is a copy after an engraving after Rubens

At Jordaens, Belgian auction house, they sell on 19 May 2015 a, "Attributed to Erasmus Quellinus II" Batle of the Amazons, estimated at 5,000 to 6,000 Euro.

It seems doubtful that Quellinus would paint after an engraving after a Rubens. The ca. 1615 "Battle of the Amazons" is now in the Alte Pinakothek in Munich. I doubt this copy is worth 5,000 Euro, if the buyers would get the right information.