The green fleur-de-lis is all over the author's facebook page, and the table of contents of the book. I didn't find any obvious reason for it in the book. Is it a clue? No french (or cajun) connections. It means "lily flower", and there are several towns in the midwest states called lily or something similar.
"Seek and Ye Shall Find" is from Matthew 7:7-8
The first page of the book has an alpha symbol, the last page has an omega.
The final QR code is a rickroll, so by AJ rules, I had to listen to the full song. I like this Martin Smith guy.