As long as the knives are legal to posses in California, they are legal to ship or transport them here.
Some items, like knuckle knives, sword canes, plastic knives undetectable to metal detectors, and knives made to look like other items (pens, lipstick, etc) are illegal to posses in this state (I'm in California) so it would not be legal to ship or transport such items here.
If a switchblade or butterfly knife has a blade 2" long or longer, then they cannot be transported in the driver or passenger area of a vehicle. But it is legal to ship them here or transport them in the trunk of ones car in this state.
But all other knives, folders, fixed-blades, single-edged or double-edged, all perfectly legal to posses, carry, ship, and transport anywhere in a vehicle.