Hello! We're sorry, we don't accept physical cash in mail. If you pay with PayPal yes, we can correlate that an account has been activated through a PayPal payment (this is essential for PayPal refunds). The information is stored by PayPal itself (just like in any transaction of any other financial institution or bank does) both in the customer PayPal account and in our accounts. Neither the customer nor us can delete that information. On the contrary if you pay with Liberty Reserve or Bitcoin