if you want to know what Shapeshifter Men In Black arejust do a search for "The Law of One" and "Men In Black".they are a temporary physical construct of The Orion Group.Ra and The Law of One will explain it for you.
The book actually contains a chapter on shape-shifting MIB.
In 1985 I witnessed MIB morph in to a large rat and then go trough door,yes trough door not under the door.
In the book, I have an account of a witness who saw an MIB change into a large black dog.
If this is any help to you? My grandmother told me her own paranormal story before she passed and it was basically a Asian man in a hat and robes; he appeared and then disappeared. It always stuck with me. This having relevance to your paranormal encounter may be polluted by my research of late?, but did you know that the First Grand Master of Shaolin Kung Fu who mastered all the styles was a werewolf? He was a lycanthrope baby left on the door step of the monks. Before him you mastered only one style as a monk. He changed everything. Very real. I took Shaolin an accredited school by the Grand Master in china and they gave us this huge book of the history sadly I lost. It had the styles, tai chi, meditation, chakras, pressure points, you name it. More and more I'm seeing my culture is a cheap Euro/Amero knock off? They had the real thing.
Many thanks, that's very interesting!