Originally posted by: Krinya
I didn't pay much attention to it excepti heard the emperor saying the one which crown prince posessed is fake ..i ff 2-3 scenes in between of other chars so i thought i mustve missed something there...the tiger tally given to gen Wang was huo family's tiger tally , he said there are minor differences so may be they caught up on that later ..I think niao's tiger tally didn't surface at any point
Yap the makers didn't explore that option of emperor going through that replaced tally. He just knew Ling Buyi used the real tiger tally & deduced the one with crown prince was fake. He didn't inspect it which Ling Buyi could ask for to be inspected if he was calm & though about surviving & proving he was Hua Wushan.
Nope Niao Niao' tally didn't surface cause Ling buyi didn't allow that as that wont pass even the 1st phase of inspection, as the tally's are supposed to have hidden magnetic mechanism with Niao Niao didn't know about & will be implicated in treason for nothing.
Initially he didn't want to get involved cause he wanted to expose crown prince's incompetence & get him disposed. But fool's luck got Niao Niao involved. He mainly used the tiger tally at last cause he was going for suicide mission & couldn't die in peace with the fool still being the crown prince i.e. next emperor 
So the tiger tally theft won't have ever been exposed if Ling Buyi didn't want to expose it or the emperor personally physically examined the replaced tally. No one would know that the tally has been replaced.
Also here is something I found today as I went to MDL to confirm something about post epilogue chapters I remember seeing long back. Posted long ago by a book reader.... this is the book version of the confrontation between Yao's SIL & Ling Buyi:
*I got a bit confused with the finale, but seem like Wang YanJi is the villain and trying to avenge her husband, Lou Ben death, she tries to trap them in an old underground palace. She mockingly told LBY how much hardship CSS went through after he left, and he told her he knows and how he regretted everything.
LBY: "I regretted it a long time ago. I regretted it when I saw Shaoshang chase after him with tears on her face on the night he kills the Ling brothers. I also regretted it when I threw her off the horse. (he jumps off the horse in the drama if you've seen the trailer) When she kowtowed to His Majesty, to Empress Xuan, and asked me word by word to withdraw from our marriage, I regretted it even more! Afterward, I traveled to the northwest, Mobei, and watched the pastures where cattle and sheep roared in countless cold nights. As long as I think of her, I will regret it again and again. I think, if I could do it all over again, I would definitely not take risks like that and risk my life. I have to restrain myself, even if I let the Ling brothers live a few more years, and even if revenge becomes more difficult, I will still take a bright and righteous path." - Chapter 178 (CSS listened in on this)