The former All-Star forward had been with Golden State since the 2010-11 season when the Warriors were near the bottom of the Western Conference. He saw the team transform into a champion and never complained about his role even as his minutes started shrinking this year. He seems like a solid guy, and the gesture here further proves you want David Lee in your foxhole.
MORE: Warriors victory parade in photos | Stephen Curry takes friendly shot at Lee
And to answer your next question, yes, guacamole was included.
See Lee getting guac right now. The Celtics staff has to be excited about this move.