It is not necessary for a man to get a special witness that the church is true if he has had enough spiritual truth conveyed by the Holy Ghost to already know that. We have people that know they have experienced the Holy Ghost visiting the temple, but fret that they haven’t received a specific revelation that the church is true.
The Lord expects us to be able to put two and two together. If you know the temple is connected to the Holy Ghost than you know the church is true. What need is there of a specific revelation of what we already know? If you know you enjoy the Holy Ghost as you study the book of Mormon, then you know the book is of god and you know that the church is true. What need is there of further revelation on that matter?
Far better to move forward from what you know to greater light than to stay back fretting over whether or not you know what God has already plainly laid out before you.