The stolen jewellery was found inside a twenty-gallon jug filled with earth, located in Nolan’s nursery where young fir trees were grown. This unusual hiding place was cleverly concealed and related directly to the clue from the coded message, specifically the “Fir” representing Friday. The setting in the nursery was an important part of the mystery because it connected Nolan’s secret code to the physical location of the stolen goods, demonstrating how subtle clues can reveal hidden truths.