...because people don't recognize a dead body as being authentic. Silly Delawarians(?).
The apparent suicide of a woman found hanging from a tree went unreported for hours because passers-by thought the body was a Halloween decoration, authorities said.
...
The body, suspended about 15 feet above the ground, could be easily seen from passing vehicles.
State police spokesman Cpl. Jeff Oldham and neighbors said people noticed the body at breakfast time Wednesday but dismissed it as a holiday prank. Authorities were called to the scene more than three hours later.