Commercial invoices are not added to the shipping boxes, but they can be downloaded on your account.
All your invoices can be found by visiting www.shapeways.com/orders and clicking "Download invoice". Please note that you need to log in first to access your Orders page.
To navigate there, you can hover over your profile icon on the top right and click on Orders:
All invoices are generated automatically and we are not able to change the information displayed on them.