Sources told The Times earlier this month a preliminary review suggested that the weapon appeared to be unconnected to the brutal 1994 slayings of Simpson's ex-wife, Nicole Brown Simpson, and her friend Ronald Goldman.
The weapon has been described as a relatively small buck knife, and some experts in the case say that it is different from the type of knife investigators believe was used in the killings.
The knife was supposedly found while crews were tearing down the Simpson estate in Brentwood after the property changed hands.
A retired Los Angeles police officer who was given the knife found by the construction worker called the LAPD to report it years ago, his attorney said, but when the agency showed no interest he kept it.