Recovered FTS server: Is it possible to show whether or not information has been accessed?

[Mary Hawking]

"A police spokesman said the server was undamaged. "Examination revealed 
the information had not been accessed," the spokesman said. FTS declined 
to comment."

http://www.computerweekly.com/Articles/2007/08/20/226280/police-recover-s
tolen-forensic-server.htm

Is it *technically* possible to be sure that information on a server has 
not been accessed, backed up during the period it went missing or 
copied?
If so, how?

Mary Hawking
-- 
Mary Hawking