Info from facebook post id

Hi,
a lawyer gave me a facebook postid (deleted) and he asked me to run some tests on it.
Although this post was deleted, by permalink.php I was able to read its content, but it is not enough.
I'd like to get even the removing date of the post, I have already tried with facebook api but I got only the creation date and the message body.
Finally, I would like to show that this page is administered by a certain person, without the cooperation of facebook how can I do?
From the post content it is clear that the writer is a certain person, with a name and fullname, but the result of my research has to be strong to stand up in court.
It's obvious that any operation must remain within the legality.
Thanks for any suggestions.