AN ENVELOPE containing white powder was sent to a premises on the Dunkirk Trading Estate near Ellesmere Port.
Police and fire crews were alerted to the package at about 10.30am on Tuesday of last week.
A Detection Investigation and Monitoring Team from Merseyside was sent out to the Telford Court property to recover the substance for analysis.
A Cheshire Fire Service spokesman told the Pioneer that a substance detection kit has since revealed that the powder was only bicarbonate of soda.
Police said they do not believe there was any sinister motive behind the package but are investigating the matter.