The time capsule was unearthed back in 1855 (160 years ago), and replaced. It is set to be re-opened on January 6th, the feast of the Epiphany.
BOSTON (CBS) — The contents of a more than 200-year-old time capsule sealed in the State House by Sam Adams and Paul Revere will be unveiled on January 6, state officials announced Tuesday.

Sam Adams (left) and Paul Revere (right) 

The 10-pound capsule was put under the State House cornerstone in 1795 by then-Gov. Adams, Revere and William Scollay. It was extracted earlier this month while work was being done on the State House, and X-rayed at the Museum Of Fine Arts.
The X-rays showed a collection of silver and copper coins dating back to 1652, an engraved silver plate, a copper medal depicting George Washington, newspapers, the seal of the Commonwealth, cards and a title page from the Massachusetts Colony Records. (read more)