The casket wasn't open, but I've been to lots of funerals where they don't open the casket. And from what I understand, she was pretty badly mangled.
9 seconds sound clip from the Fugue in C Minor (Suspense) classic radio play.
You can hear this line at 00:16:22 in the radio play.
Quote context
[...]
- Even if the children had been able to come home, I wouldn't have let them look.
- The coffin was sealed when I left Philadelphia. I didn't want to see her again myself.
- But there was a funeral. People came, there were flowers, an undertaker...
- Yes.
- Well, if they could believe that. If there was one witness... Perhaps my own sister Lizzie...
- That's the way it was. So you see, David, my sister Mrs. Chumley was there.
- Yes. But how did she know it was Mama? She didn't see Mama, did she?
- Well, nobody saw your poor mama, dear. She wouldn't have wanted anyone to see her.
[...]