Not sure if you guys heard yet, but Posey already got an offer from the Celtics and did not like it. He is seeking full mid level which is about 6 mill and the C's did not offer him the full MLE. From Boston Herald:
By Mark Murphy / Celtics Notebook
Free agent James Posey, via agent Mark Bartelstein, continued to talk to other NBA suitors in the wake of what he considers an unacceptable offer from his former team - one that falls short of the $5.8 million mid-level exception as well as his desire for a 4- to 5-year deal.
Personally, I think he deserves the full MLE.