I filed I-130 for my brothers, and got approval letter. Our priority date is 2000, and it won't be current for another 5 years.

I read from http://travel.state.gov/visa/immigrants/ty...types_1309.html,
"We recommend that you wait at least three weeks after you get your Notice of Approval before calling NVC if you have not heard from the Center by that time. "
and
"If your case is not current, we will send you a letter informing you that we have your file at NVC and will hold it until your case becomes current".

After we got the I-130 approval letter, neither I, the sponsor, or my brother, the beneficiary, ever heard from the NVC or received a letter from the NVC that said that they have the file. Are we suppose to get this letter from the NVC ?
Thank you.

Try calling the NVC at 603-334-0700.. you can give them your USICS case number and get a status update

Thanks
USICS case number is the approval number, right ?
Unfortunately, I do not have it with me today, I need to get it when I get home tonight.

Does NVC really send that letter after I-130 is approved ? Is this sent to the sponsor or beneficiary ?
What does it mean if we do not get the letter ? It's been 6 years since the I-130 was approved.

Yes, the USCIS case number is the approval number.. it should start with a three alpha chatacters with 10-12 digits thereafter i think.

I know you should receive an a letter from USCIS after your I-130 is approved.. but wheter the NVC sends you anything I'm not sure.. since I'm applying for my spouse.

Based on my expereince for my spouse.. once NVC received my case, they didn't send me a letter "acknowleding receipt of my case".. but since spouse visa's are deemed current, the NVC started processing my case straight away.. so in my case.. my wife received a letter to assign a choice of agent.. and then sent out the fee bills and applications as my timeline indicates below..

For your brother.. you or your brother may only receive communication from the NVC when your application becomes current.. again, I would just call the NVC to make sure they have your case on file to put your mind at ease

I checked at 603-334-0700 and it said Case # assigned by NVC for this case is: .....Visa symbol: F4
It means that the NVC has my case on file, right ?

Yep.. they have your case on file... now it's just a matter of waiting until your case becomes current. At that time you or your brother should receive some sort of communication from the NVC to finish of the process. You may want to call the NVC and talk to a live operator and ask when your case is going to be "current"..

Thanks for your help.