Your permanent certificate will only go to the address that you used on the 8710 form that you completed for the FSDO.
The "No Tell Motel" won't do it, nor will some distant relations trailer in the backwoods!!
You are well past the date that they should arrive, and if the above is not the answer call the OKC folks as has been suggested in other messages. They have been very good lately about getting them out in minimum time.
BaD.