NE Aug filer

Hello, You should be able to call in and ask for the case number in two to three weeks after your I-130 is approved (That's what I did). If you provide an email address, NVC will send everything to you by email.
Calling NVC can be very helpful comparing to USCIS, but you need to be very patient. I usually call very early in the morning or late at night to avoid long wait, usually you will be able to talk to someone within 20 min. If you can during the date time, it can take forever. The longest I waited was 45 mins. because of the high volume of call they receive, you wont even get in sometimes if you call during the day. 

Thanks for the advice, I will request to speak with a tier 2 officer.