I'm wondering if it's legal or not to purchase a sword online in ny.?

I want to purchase one for my husband for xmas becuase he collects them but if im going to get chased after by the police its not worth it. And no it is Not for outside use. So when i went to go purchase a sword online and when i went to check out this was in red writting."As we are unable to anticipate every state or local law and regulation regarding cutlery in every region in which our clientelle resides, please use good judgement, and if an item in your shopping cart is not considered legal to posess in your area, remove it from the order and avoid any conflict regarding such matters, before your state and/or local law enforcement is required to be involved" Thanks for all your help