I want to keep this gift as a surprise.

As a lot of people do order our packages as gifts for others, we try not to include physical invoices with our star packages when shipped, instead opting to send our invoices via email directly to the email address as provided at the point of purchase. We will only send a physical invoice with our packages in order to ensure that the package is able to pass through any international customs.
We even send all our packages in plain outer packaging, meaning the contents can remain a surprise until opened.