Istiaque Hassan

Hi, We received the immigration visa but no "Sealed immigration packet" was given to us as described in the link below. Is this normal or should we write to US consulate about this issue? Note: we've submitted the forms and documented to NVC electronically. Link: https://travel.state.gov/content/travel/en/us-visas/immigrate/the-immigrant-visa-process/interview/after-the-interview.html