God, that was ages ago, long story but here's what happened:
I'd asked my friend to pass the gift to Takabayashi sensei during Comiket (which I unfortunately can't go) so he did pass to her assistants but he didn't know he was supposed to pass it to Matsumoto Sensei as well T.T So 2 weeks ago, during our meetup, he suddenly said,"Hey! I still have the other gift but I didn't know who to give it to." And thus, the gift traveled back to me and I subsequently sent it over to Matsumoto sensei.
Here's her reply (4 June)
先日編集部から届きました。皆様のお気持ち大変嬉しく思います。いただいたお手紙も品物もとても大事にしますね。まるマを応援してくださってありがとうご ざいます。皆様のご健康をお祈りいたします。もう少しゆっくりお返事するつもりでしたが、DMをいただいたため簡易なお返事にて失礼いたします。
It translates to:
I received it from the editorial department 2days ago. I am very pleased to feel the support of everyone! I will take care of your letters and items (meaning the presents) that were received. I pray for the health of everybody.
YAY!
Anyway, here's some photos of the project
front page
placed the gift in a plastic cover
my own :D Note: I didn't receive any reply from Takabayshi Sensei though D: