I would assume that eBay use an automatic 'search engine'....to search for listings using "ivory" in the description/title. I have seen a number of weapons described as having iv*ry.........ivorry ....and ivery ...so either speeling isn't their strong point (
) or some sellers have the need to hide the 'word' already.
It suggests to me that a 'coded' form of 'ivory' will be used. Sellers would want you to know that it was more than 'mere' bone. Only trouble would be that if a dishonest seller gave you the impression (within the listing) using perhaps, the 'coded' word....that a sword was ivory hilted. Only for the buyer to discover that it was bone......you would have no re-dress through paypal for a refund. Plus the fact you would surely have to prove that the 'code work', say, for instance 'white bone', actually meant 'ivory'., if you tried other means to obtain a refund
Regards David