You know what? There is a simpler way: create a new wallet, fill it with money, encrypt it, sell and send the whole wallet to someone via email.
Done.
Do it via multiple jurisdictions and the trace is easily lost.
I don't see what problem this would solve.
Step 1- create wallet. Ok, no problem here.
Step 2- fill wallet with money. Oops, how are you going to do this without it being traceable? Any money you send into this wallet from yours is going in as a transaction and recorded forever.
Step 3- Send/mail wallet. Ok, no problem, although if you are going to mail the wallet it'd be just as easy to mail cash, so why bother with bitcoins at all?
You gotta fix step 2 in order to make it work. And if you can fix step 2 (add money to wallet without leaving any transaction evidence), you could just add money directly to the seller's wallet, rendering steps 1 and 3 unnecessary.