Jeanneret, Corbusier both designed ashtrays/cendriers a few on ebay at mo can they all be wrongly attributed?
Can they all be wrongly attributed?
YES! It's definitely possible, though I am not saying it's necessarily so in this case.
I collect prism tiles (Luxfer etc), and pretty much every single one for sale is claimed by the seller to have been designed by Frank Lloyd Wright, which is just not true. This is called "salesmanship". Sellers try to claim, or at least mention, that whoever is most famous in that area of design had something to do with it (Tiffany, Corbusier, Wright, etc), if only just to attract more attention and searches.
Caveat emptor!