Home of Brown

The home of Brown line reads:

Put in below the home of Brown.

Put In

A ‘Put in’ is a nautical, fishing or boating term meaning a place where you can put in (or take out) your boat. It could mean to park up or set off.
A ‘Put in’ could be referencing a cave, or a crevice where Forrest Fenn’s treasure might be hidden. – Maybe ruled out because ff has said not in a cave.
A ‘Put in’ could be referring to the treasure being ‘Put in’ water.  – Maybe ruled out as ff has said not underwater.

the home of Brown

the home of Brown – Brown is capitalized suggesting that Brown is a name.
the home of Brown – Could be a Mountain called Brown (Kirwin)
the home of Brown – Could be a Canyon (Browns Canyon)
the home of Brown – This could be the Brown family
the home of Brown – This could be where Brown trout are plentiful or raised (hatchery)
the home of Brown – This could be where a Brown owl or Brown bear or some other type of bird, animal or fish is known to reside.
the home of Brown – Clara Brown
the home of Brown – Molly Brown
the home of Brown – Francis Brown or Nephew Richard Brown of Taos.  Francis Brown helped protect the Wyoming Medicine Wheel.