Thanks for posting this, Cuttlegirl. I've never seen anything like this on e-Bay before.
That really is a bizarre item, for one thing fossil squid beaks are rare items, and especially so beaks of this size. It could just possibly be from a giant squid of some form as the fragments have the right triangular-ish profile, but on the other hand, it's so difficult to say exactly what it is.
It would help if the listing provided some form of context for the item, as in where it was found, but there is nothing there. In fact the whole e-bay shop seems weird to me, with someone trying to sell a collection of Megalodon teeth that her deceased husband collected. His death is almost used as a selling point.
Really sorry, but the jury is out for me. Interesting spot though, thanks!