Police in Michigan are appealing to people to surrender their instant riches after a box with $30,000 fell off the back of a truck.

Authorities in Grand Haven say drivers stopped Thursday to pick up cash for themselves.

Only $2,500 was immediately recovered and returned to the owner, who had forgotten that a cash box was on the truck�s bumper. Traffic was backed up on U.S. 31 after money hit the ground.

But by Saturday, more money was trickling in. The Department of Public Safety says two teenagers turned in $630, and a woman gave up nearly $3,900.

The department says on Facebook : �We commend you for your honesty!!�

(AP)