"USCIS recently began transferring some casework from the National Benefits Center to the Nebraska, Texas and California Service Centers to balance overall operational workload. The affected casework includes the following form:
Effect on Customers: If your case was transferred, USCIS will send you a notice listing the transfer date and where your case will be processed. Your original receipt number will not change and this will not further delay the processing of your case." - USCIS, Oct. 21, 2013.