At about 2:20 p.m., the Darien Police Department tweeted that the situation was secured and that the store would open shortly.
No injuries were reported.
The incident started at about 11 a.m. at the Wal-Mart in the 2100-block of 75th Street in the western suburbs.
Police had said they took pictures of the package and felt it needed to be checked out by the bomb squad.