Are you saying that you purchased a California car with no title, no bill of sale?
There is a process in California that involves a vehicle transfer with lost title. Is the seller cooperative? If so, that is the easiest path. I have no idea how you got a shipper to ship the car without documents. Is the car in your possession?
If seller is cooperative, you should have seller complete CA DMV form REG227 (see attached, or email me and I will email the form to you) to transfer the title into your name. I don't know if you can do this without paying sales tax. Or if you really trust the seller, have the seller obtain a duplicate title and send that to you.