Most likely you’re gonna be pumped full of embalming fluid if you’re buried, at which point you’ll be toxic waste inside a by-law sealed casket.
Old German joke... “Why are your grandpa’s ashes in an hourglass?”
Answer.... “even tho he’s dead, grandpa must work!”
For me take out anything useful/reusable, burn the rest, do what you want with the ashes, they were only on loan anyhow.