The most recent report by Justice Department Inspector General Glenn Fine covered the period of February 2002 through September 2005, and said 160 laptops and the same number of weapons couldn't be accounted for, The Washington Post reported Tuesday.
That's an improvement over the previous audit, which said 317 computers and 354 weapons such as shotguns and submachine guns couldn't be located, the newspaper said.
The audit said aside from the 10 missing computers known to contain classified information, there was uncertainty about what kind of data was on at least 56 of the missing computers.
The report said the agency FBI maintains more than 52,000 weapons and 26,000 laptops.
FBI Assistant Director John Miller issued a statement after the audit's release Monday, emphasizing how the average number of laptops or guns that went missing dropped from about 12 per month to four per month for each category in the most recent review.