Yes they sold them as nassrius to me when i get them back i said him it was olive snail and he told me he knew he made a mistake he give me 10 real nasarius for free
I've seen those in Florida on the beach, they act like nasarius snails but I don't believe they are, I've even collected a few shells that were close to three inches in length, big for a nasarius if they are.
Agreed, after those new pictures and sizes those are definitely not nassarius (as you obviously know now)! Hopefully they didn't do any damage! @Lionfish Lair's invert knowledge is spot on, nice call!