A Taco Bell employee mistakenly passed the cash to the trio instead of their food on June 29. The money was returned a short time later.
Kennidi Rue, 18, said she and two friends thought about keeping the money, but decided they would feel guilty if they didn't return it.
Grand Rapids Police Capt. Jeff Hertel confirmed the incident, saying an officer was called to assist.
"I thought it was joke," said Rue, of Holland. "I thought we were on camera. ... The store manager literally just burst out in tears. She was so happy we brought it back."
The money was in a store bag for deposit at a bank.
Rue; her boyfriend, Grant Kruse, 20; and another friend, Luke Postma, 25, got their meal when they returned the money. Kruse and Postma are National Guard members who were in Grand Rapids for training.