Ive bought 20+ knives from USA, folders, fixed blades and swords, no problems, no forms/permits neccesary.
Just no flick, butterfly, gravity, double edge etc knives allowed, they are stopped at customs, you can obtain certain ones if you are a knife collector with collector club membership i beleive. And have the neccesary permits/documentation.
Only for certain knives ie, flick, butterfly, gravity, double edge etc.
I have 2 ceramic knives bought from king of knives right here in aus, definatly no illegal.