give them a call
You should have got your card by now. Maximum waiting time to receive plastic cards after entering the country through CP is one month. The cards for CP people are done by a private company in Texas (for east coast entry):
"The Immigration Card Facility (ICF) - (214) 655-1500
The ICF is not a government agency per se, but a private contractor based in Arlington, Texas. All alien registration cards (also known as "green cards" or form I-551's) are manufactured there. If more than six months have gone by since the temporary permanent residence stamp was placed in your passport and you still haven't received your plastic green card, you may want to give the ICF a call. "
Additionally I had compiled the approximate waiting times for plastic cards for various POEs:
Atlanta - 8 days
Detroit - 11-17 days
Boston - 14 days (consistant)
New York - 15 days
Houston - 18 days
Chicago - 20 days
Newark - 22 days
Los Angeles - 22-28 days
San Fransisco - 25-40 days
West coast PR plastic cards are sent from Laguna Niguel, CA
Please post your experience for the benefit of others.
good luck.