(Everett, WA)  --  Snohomish County, Washington investigators say they've found the remains of a young girl covered in concrete inside a plastic tote in Everett.  Sheriff's deputies believe the girl died several years ago while under the supervision of her mother and the mother's boyfriend.  Authorities say it appears the couple panicked after the child died and placed the body in the plastic tote, rather than report the death, the manner of which hasn't been determined.  Detectives say the girl's body was found Saturday at a home on East Gibson Road.  Authorities believe the girl was about four-years-old when she died and would be nine-years-old if she were alive today.