These days the USCIS is very efficient in sending out your green card soon after your arrival in the US, so there must have been some sort of problem with your US mailing address. If the card was returned to the USCIS as undeliverable, you’ll have to apply for a replacement card.
If you have an attorney, he/she should follow up with the Texas Service Center (TSC). If you don’t have an attorney, contact the USCIS National Customer Service Center at (800) 375-5283.
Edward Weiner
Attorney at Law
E-mail: E.Weiner@immigration-aux-usa.com
Internet Site:
http://www.immigration-aux-usa.com/