I have a question: Do we need to write our NVC case number at the upper right-hand corner of each document of the DS-230 package?

It's a GOOD idea in case they drop a bunch of different petitions together. Easy for them to get them back together.
I imagine it happens!

yeah.. u need to write ur Case number to the upper right hand corner of all the documents u pass at NVC.. good luck

i did, in fact i wrote it on every paper i sent to them in both the DS-230 packet and in the Affidavit of Support papers.....Im sure it wont hurt to do so.

Thank you all for your replies