First Clue: Follow Bob’s exact path from Bob’s Brilliant Axes (1 east, 7 north, 5 west, 1 south) and dig west of the plant by the north-western window.
Second Clue: Dig south-west of the large crate behind Lumbridge Castle’s kitchen door.
Mysterious Orb: Feel the orb repeatedly. Warmer temperature means you are closer (Chebyshev distance). The dig site is four tiles north of the bush near Leela, north-west of the Draynor jail.
Final Cipher: ESBZOPS QJH QFO decodes to DRAYNOR PIG PEN. Dig in the centre of the pig pen north of Draynor market.