To be honest, I have never been working with gift messages in Magento, so I got very surprised once I saw that there is no output for it in any
document that customer recieves. This time I got request from client to write gift message on PDF packingslip.
Actually this is somewhat easy and goes like this…
1) Rewrite this class: Mage_Sales_Model_Order_Pdf_Shipment
Put this in your config.xml