In addition to the letters, Mr. Kaczynski sent Mr. Sanchez a bright memento of their postal relationship: a wooden cylinder that Mr. Kaczynski had carefully carved, stained and painted. Mailed as a Christmas gift in 1994, the cylinder bears the motto: "Montani Semper Liberi," Latin for "Mountain Men Are Always Free."

Carefully incised in the hardwood, the decorations include vines stained green, berries stained red and a rabbit stained white. Polished smooth, the wooden cylinder has a small, detachable cap and hollow interior. ...

"I think it's for carrying pens," the old man said, turning over in his hands what looks like a model for a wooden pipe bomb.