McGowan, the post said, had just purchased all the girls' remaining cookies, worth $540, so they could get inside and away from the cold weather.
Dillard, whose 8-year-old daughter is a member of the troop, said the man didn't give his name.
Greenville is about 140 miles (225 kilometers) northeast of Atlanta.
He is accused of conspiracy to manufacture and distribute heroin, cocaine and fentanyl as well as conspiracy to smuggle more than $1 million in cash.
Detric McGowan stands charged by the Drug Enforcement Agency with conspiracy, drug trafficking, cash smuggling, possession with intent to distribute heroin, and various other charges surrounding an investigation ongoing since September 2018.
"This man purchased seven packs of cookies. I'm taking them all so y'all can get out of this cold, '" Dillard said, noting the man dropped $540 on the addictive candies.
"What an unbelievable soul". "I'm taking them all so y'all can get out of this cold", wrote Dillard.
In total, this man purchased $540 of Girl Scout cookies, and with a heart as big as his, there's a good chance he's sharing them. Girl Scout cookie season, that is. Dillard said the number of packages the man, who didn't give his name at the time, bought would have likely taken about another day and a half of efforts to sell.
"When he told us to pack up all the cookies because he was going to buy them we were shocked", she said.