[Marauder]

They could've used a piano crate. That presumably would've been large enough, depending upon where the lady carried most of her weight.

But would it have fit into a standard size vault?

[radiohead]

But would it have fit into a standard size vault?

Nope. I don't know if it was here on FR or elsewhere that I read that the funeral industry is responding to the problem of larger dead Americans. They have to resize the vault, the hole and the casket. Apparently over a certain weight you can't even be cremated because the incinerator won't handle the weight, while some of those below this threshold are opting to be cremated rather than pay the additional charges for outsized caskets, vaults, etc.

All of this is creating a nice little profit center for them.

More than you wanted to know? : )