A fifth and final member of the practice squad is expected to be signed today.
Swiney, a rookie free agent from Nebraska, closed out the preseason as the Packers' second-leading tackler with 19 stops, 18 of them solo. He also recorded one quarterback sack.
Seymour, a rookie from Michigan, had one catch for 22 yards. He's been cut and re-signed twice during this preseason.
Eby, a 6-3, 300-pound free agent from Kansas State, played extensively in all four preseason games in the absence of starter Mike Flanagan, sidelined by a broken thumb.
Lewis, out of Southern University, was signed only last week and played in the Packers' preseason finale against Tennessee but did not have a catch. He also played on special teams.