I think the proper term would be "Pac's random rhyme pages". Who knows what he did with em all, but some have been reproduced, so it's possible he tucked them in the same place he kept the counterpart track.
I'm sure Pac didn't have one rhyme book. Even while having plenty of rhyme books, there are probably hundreds of songs on loose paper--whether they be entire songs or lines that were never completed.
I think the proper term would be "Pac's random rhyme pages". Who knows what he did with em all, but some have been reproduced, so it's possible he tucked them in the same place he kept the counterpart track.