Uh, no. July three years ago was the summer after “The Great Unboxing”.

Lottie’s 19 now. Three years ago, she was 16. I’m not sure whether you’re counting “Space is the Place” as case 9 (it didn’t have a case number on the old site, I guess because it’s not “The Case of…”), but it overlaps with “Missing Piece” anyway, so it doesn’t matter much. Lottie’s still 14 in “Space is the Place”, and doesn’t turn 15 until around the end of “Missing Piece”/beginning of “Severed Alliance”.

Shauna identifies them as “15-year-olds” in “Space is the Place”, but while she is, Lottie isn’t yet. It’s set sometime in the spring/early summer, and Lottie doesn’t turn 15 until that July. Even Mildred, the oldest of the mystery kids, doesn’t turn 16 until the very last strip of “Severed Alliance”. Shauna turns 16 a month and a half later. Sonny turns 16 a week after the end of “Hard Yards”. Lottie doesn’t turn 16 until the next July, which is after the events of “Wen-Tack”/”Parents”/”The Great Unboxing”.