The “Secret Language” contained in your Receipt Number

What do those letters and numbers mean in your receipt number?  Let’s use the following example:  WAC-15-123-12345. The first three letters (WAC) reference which USCIS Service Center was initially assigned to process your petition.  I say “initially assigned” because sometimes, due to processing backlogs, etc., USCIS can “transfer” your case to a different location.  If…
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