"Oh there's a lot of goodies in here!"
The Standard Welcome Package is normally given to those who defect to the Good Side (or possibly join the Good Side without an evil past). It was shown when issued mistakenly to Dr. Doofenshmirtz in Voyage to the Bottom of Buford; Heinz accidentally saved a cat and became an instant hero thanks to unwanted media attention.
Gift baskets tend to be how The O.W.C.A. relays information; when Agent P was reassigned to a new, more evil villain (The Regurgitator) , Heinz was notified of his new nemesis (Agent S) through another gift basket.