Who? I want the first person to open the box to get the data be fully trustworthy. That person can upload the data. If the first person to open the box is evil they can substitute whatever data they want.

We are talking about governments here so the conspiracy theory that the person who opened the box substituted a different set of data is actually possible. Conspiracy theory territory for sure, so you really want to make sure that a fully trusted third party is involved. France seems as good as anyone to fit that bill.

Yes, I was thinking the trusted party with authority to open the box could dd whatever storage is in there and share the image(s) publicly.

If you were worried about conspiracies then multiple aviation authorities, or government departments, could send observers to watch the opening and imaging.