If you have previously engaged in a drinking contest with Thaler, you have a seemingly useless book, Shadow People, or the story of His Majesty's Secret Service. If you speak to the bootblack a second time, you will notice that you now have the option to give him a gift. Give him the book.
At this point, he says "You know who I am... ahem, I thought that scroll had disappeared for good.", which confirms that he is in fact Ori Reuven. After a bit more conversation, he gives you the Prophet Lebioda's signet ring, which will help Geralt get past Grandma at Shani's place.
Inconsistency with the booksEditovat Editovat
Since Ori Reuven is said to spend six years in different prisons after the Nilfgaard War and the game events take place five years after the novel's ending, Ori should technically still be a prisoner and even if he was released he should be more of a human ruin, nowhere near the more or less healthy condition in which Geralt encounters him. (To be fair, his is the same model used for most beggars...)