Hes been deceased for almost 3 months, Even if Michael was in a freezer he still wouldn't look like Michael if the casket was open. When you die your body does some wierd changes. When my aunt died her funeral was 6 weeks later due to it being ruled a homicide and when we did have the funeral she didn't look like herself, She looked bloated and she was turning a greenish color and she was in a freezer.
There is some food for thought.