He shouted, "You guys got me a gun!" Alvarez-Rodriguez told the Daily News.
Alvarez-Rodriguez and her husband, however, were mortified.
The Crestview Police Department was called and an officer checked the couple’s identifications to make sure they were not convicted felons, according to Maj. Andrew Schneider, public information officer for the police department.
The officer originally allowed the father-to-be to keep the rifle, but the next day police asked him to surrender the weapon, the Daily News reported.
The incident remains under investigation, Schneider said.
On Monday, a Goodwill employee said she couldn’t comment on the matter.
Alvarez-Rodriguez can now laugh about the incident.
"Goodwill has the best treasures for $9.99," she told the Daily News.