"It almost looked like a car battery, like a jumper box almost," said Morgan. "It had two hoses coming out of the top of it."
Morgan said he went to Walgreens at around 1 p.m. Monday to get some milk, when he noticed the device.
"Whenever I was walking out, I noticed the black box," he said. "It caught my eye, but I didn't think anything of it."
Neither did anyone else, at first. But five hours later, another customer spotted the device and reported to a Walgreens manager, who then called 911.
Officials from the FBI, Joint Terrorism Task Force and the Burean of Alcohol, Tobacco, Firearms and Explosives all responded to the scene.
"They brought the robot up and checked out the scene, and I think that's when they realized that it was actually an explosive device," said Morgan.
Authorities eventually detonated the device.
"Kind of sounded like an M-80 thrown in a trash can, to be honest with you," Morgan recalled.
But the explosion could have been much worse. Morgan said the device was sitting right next to a cage of propane tanks.
Now, just the knowlege of such a threat was too powerful for him to ignore.
"To think that I walked right by a bomb at 1 o'clock in the afternoon to get some milk is pretty scary," said Morgan.
Authorities said they did not immediately know why someone would target this Walgreens, or who called in the tip.
Investigators said they will send what is left of the device to a laboratory to get whatever evidence they can from the fragments.