I've done some poking around and figured some books that could possibly be in Afterlight's May and June 2023 boxes!
These are very much just theories and total conjecture; therefore, they could be right or wrong. I made my decisions based on some clues from the authors based on release date and one of the authors, Rachel Lynn Solomon, posted a photo of stacks of signed tip ins. The others have social media connections and convenient release dates.
Obiligatory disclaimer: I am not sponsored or affiliated with any of these boxes. Additionally, a mention on my page does not mean I endorse the box(es), the book(s), or the author(s). I am simply providing information.