Time Capsule from 1795 Found in Massachusetts State House

Sure, Ohio wasn't yet a state, but Samuel Adams and Paul Revere were placing a time capsule in the cornerstone of the State House building in Boston (h/t Kaye):

A chance discovery by a group of repairmen in Boston has led to the unearthing of a centuries-old time capsule, believed to have been buried there in the 1790s by Paul Revere and Samuel Adams.
The antique time capsule, which had been placed in a cornerstone of the Massachusetts State House, was discovered this week when workers who had been repairing a water leak at the building stumbled upon it, CNN reports.
Museum of Fine Arts conservator Pamela Hatchfield was promptly called in for her expertise, and on Thursday, after about seven hours of painstaking, backbreaking work, she -- with the help of several workers -- successfully extricated the almost cigar box-sized container from its burial place....
The time capsule is believed to have first been buried at the State House in 1795 by revolutionary war hero Paul Revere and Samuel Adams, who was the governor of Massachusetts at the time. It’s thought to be one of the oldest time capsules in the United States.
According to the Boston Globe, the antique container was unearthed once before, in 1855, when emergency repairs to the foundation reportedly led to its temporary removal. However, it hasn’t seen the light of day since. 
As for what treasures the capsule may contain, Massachusetts Secretary of State William Galvin told CNN the box is known to house “a Paul Revere plate, papers, and coins from the 1600s," among other artifacts. The condition of the container's contents, however, remains unknown.
Galvin said that the capsule will be X-rayed and examined by experts, and its contents will likely be revealed to the public next week.

I would expect those coins would be pretty valuable.