I believe Bugatti is Hiding La Voiture Noire

My theory is that Bugatti effectively faked The Missing Black Type 57 SC Atlantic's Death, instead sending it to monaco were it would eventually be painted Grey to hide it.

No. 57473 (pictured above) was supposedly the second Black car after the Missing no. 54754 (La Voiture Noire). So instead of there being 2 Black Type 57 SC's there was only one and they used the Legend of the Black Cars disappearance to at first hide it from Germany. And later to gain Free Publicity online.