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Before you call anyone, assess your situation leading up to the find.
We're you you using a gasoline, pollution spewing, global warming riding mower?
If so, expect felony take down when authorities reach the scene.
You will be the prime suspect of this crime.
Do you really want to invite the law to your propery?
S.S.S.
If have you touched or moved that straw, you have contaminated the crime scene and that is obstruction of justice!