The reason to make these tapes; are to, forward all the tapes after listening to the next character, blamed. That means Clay no. 11 has to forward it to number 12 which is not Mr. Porter but indeed Bryce (12). So, the continuity of the whole tape passing was broken.
If Bryce, would have received the tapes he would have probably burned the evidence, enforced Tony to submit the evidence or Tony may have made it public.
Worst case scenario, Bryce uses his money power and never goes under trail. See more
[to Mr. Porter about Hannah about the day of her suicide
She walked out of school went home and put some things in order. She returned her uniform to the Crestmont where I worked with her. She didn't say anything. She dropped it on the counter and walked away. She dropped a package off with a friend, then took another to the post office. Then she went back home, put on some old clothes, she went into the bathroom, filled the tub, opened the box of razor blades she took from her parents' store ...