What is chronologically the first Murdle case?

I ask this because I wanted to include it in the Murdle wiki, on the Deduction Grid page. The problem is that there are two possible candidates: the first case in the Freshman Chapter of School of Mystery, and the tutorial case in Volume 1, which claims that Logico solved it in his Junior year.

So, which out of the two is, chronologically, the first case Logico ever solved?