Salam 'Aeykum, If that is the case then I also have knowledge of the unseen. You ask, how? I say: Because I've read some things that the Prophet (SAWS)said will happen in the future, thus I know some things from the unseen. In this sense, the Prophet (SAWS) does not know the unseen except what Allah has revealed to him, and Allah did not reveal everything to him otherwise he wouldn't have chosen those archers who stood on top of the mountain and later cost the Muslims the battle after they went down to the battlefield to collect the spoils. And more importantly, He (SAWS) would not have been ordered to say this: Say, [O Muhammad], "I do not tell you that I have the depositories [containing the provision] of Allah or that I know the unseen, nor do I tell you that I am an angel. I only follow what is revealed to me." Say, "Is the blind equivalent to the seeing? Then will you not give thought?" [6:50] Say, "I hold not for myself [the power of] benefit or harm, except what Allah has willed. And if I knew the unseen, I could have acquired much wealth, and no harm would have touched me. I am not except a warner and a bringer of good tidings to a people who believe." [7:188]