There was a case where the husband killed his wife, put her in the freezer, and used a wood chipper to dispose of her body early in the morning during a snow storm from a bridge. A witness drove by. He used a credit card to rent the chipper in the relevant time period. The police did a systematic search of the river and seived out remains of bones from the wife. They found portions of some pieces of her skeleton that indicated an unsurvivable wound. The husband was convicted of capital murder.
First problem he made was using a credit card to rent the chipper. Cash is KING!
Never, EVER dispose of remains in such a public manner! Chip’em, bag’em and dispose of in small bags spread over multiple locations.
An alternative would be to dig a small pit, place the remains in and burn the hell out of them. Cover, camouflage and never return.
This guy was an amateur playing Big Time.