USCIS (Chicago Lockbox)
09/29/14 - sent I-130 for both parents (in one package)
02/10/14 - they received both I-130
NVC
01/08/15 - got an WELCOME LETTER (PAOSF) emails from NVC with NVC Case numbers and Invoce ID Nimbers (3 months 10 days from the day I-130 form was sent).
01/10/15 - DS-261 Completed for both parents.
01/25/15 - AOS bill paid
??/??/15 - IV Invoice "NOT INVOICED" YET (as per 02/21/2015)