Inside the gift contains a rare book on Transfiguration that Regulus found in his family library and a small, plain leather binder/organizer charmed with far more space on the inside than the outside so that she can keep things organized but not have to carry around anything large.
And a note that reads:
Aludra,
Happy Birthday. I am sorry these gifts are belated but I wasn't certain able to retrieve this book from my Uncle's home until last night and I wanted it very specifically because I thought you would find it interesting.