He isn't revealing details about the items but refers to them as "significant."
Other evidence was found last weekend in a hunting cabin in the neighboring town of Bellmont.
Guess says the search effort is moving north toward the Canadian border.
Authorities say more evidence left behind by two escaped New York prisoners has been found in an area near the Canadian border where more than 1,100 law enforcement officers are concentrating their search.
State police Maj. Charles Guess says the items were found Thursday at a cabin and Friday morning in a field, both in the town of Malone, 30 miles northeast of the maximum-security prison David Sweat and Richard Matt broke out of June 6. Guess says the items have been sent to a forensic lab for testing.