My adopted (foreign born) daughter's announcement was placed in the paper (in 2002) by me making a phone call. I didn't want my adopted daughter to feel any different then my biological one, so if you go back and look it says “a baby girl, born to (us) of (our place of residence) on (DOB)". If you didn't know she was born in China, you wouldn't find it in the birth announcement section. No proof was asked for. I could have added at such and such hospital. This in 2002, no verification necessary.
What a thoughtful thing you did. Hopefully, your guys love is more important than an announcement.
...and it is interesting that something can look official and really have no factual basis behind it.