When I said “Writings” In was not referring to the prophecies; I was referring to the scriptures.
However, since you brought it up, there are prophecies that were fulfilled by the coming of Baha’u’llah and then there are predictions of the future that He made; these are two different things. Let me be clear though; Baha’u’llah did not make predictions in order to prove who He was; sometimes He made them to warn people of what would happen in the future.
Aside from what He wrote about God and spiritual matters, Baha’u’llah wrote about many practical matters. We know that Baha’u’llah did not have more than a rudimentary education so there is no explanation as to where He acquired the knowledge that He had.
Not only did Baha’u’llah know things He did not learn in any school, He also predicted many things that later came to pass. Here is a partial list of specific things Baha’u’llah knew and things He predicted that later came to pass:
1. The fall from power of the French Emperor Napoleon III and the consequent loss of his empire.
2. The defeat of Germany in two bloody wars, resulting in the 'lamentations of Berlin'.
3. The success and stability of Queen Victoria's reign.
4. The dismissal of 'All Pasha as prime minister of Turkey.
5. The overthrow and murder of Sultan 'Abdu'l-'Aziz of Turkey.
6. The break up of the Ottoman Empire, leading to the extinction of the 'outward splendour' of its capital, Constantinople.
7. The downfall of Nasiri'd-Din Shah, the Persian monarch.
8. The advent of constitutional government in Persia.
9. A massive (albeit temporary) decline in the fortunes of monarchy throughout the world.
10. A worldwide erosion of ecclesiastical authority.
11. The collapse of the Muslim Caliphate.
12. The spread of communism, the 'Movement of the Left', and its rise to world power.
13. The catastrophic decline of that same movement, triggered by the collapse of its egalitarian economy.
14. The rise of Israel as a Jewish homeland.
15. The persecution of Jews on the European continent (the Nazi holocaust).
16. America's violent racial struggles.
17. Baha'u'llah's release from the prison of 'Akka and the pitching of His tent on Mount Carmel.
18. The seizure and desecration of Baha'u'llah's House in Baghdad.
19. The failure of all attempts to create schism within the Baha'i Faith.
20. The explosive acceleration of scientific and technological progress.
21. The development of nuclear weapons.
22. The achievement of transmutation of elements, the age-old alchemist's dream.
23. Dire peril for all humanity as a result of that achievement.
24. The discovery that complex elements evolve in nature from simpler ones.
25. The recognition of planets as a necessary byproduct of star formation.
26. Space travel.
27. The realization that some forms of cancer are communicable.
28. Failure to find evidence for a 'missing link' between man and ape.
29. The non-existence of a mechanical ether (the supposed light-carrying substance posited by classical physics), and its redefinition as an abstract reality.
30. The breakdown of mechanical models (literal images) as a basis for understanding the physical world.
You can read exactly how these predictions were made and how they came to pass in the following book from which they were cited:
Gary L. Matthews, The Challenge of Baha'u'llah
Out of those 30 predictions you should be able to find some that are pretty specific.
Here is the problem with Baha’u’llah giving exact dates and locations; as I told you He was not trying to
prove anything with His predictions. More than anything else they were warnings about what would happen in the future, not to be used as evidence as His Prophethood.
History is history. There are many accounts of His life and they are factual accounts. I do not understand how meeting these people would make any difference and of course that is impossible.
Interestingly, meeting someone is not going to tell you much about them, not as much as the accounts of what they did in their actual life. Many of those who knew Baha’u’llah and were closest to Him denied Him because they were spiritually blind, so they could not see who He was.