Java cannot cast from list of raw generic type to list of wildcard generic type

Question

Here's a quick little generic class to make this question easier to understand. You can pretend it "boxes" a value if you want.

public class Box<T> {    }

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Question

Now, in my main method, I can have this:

Box b1 = new Box<>();
Box<?> b2 = b1;
Box b3 = b2;

So it's quite clear to me that a raw Box and a Box parameterized with a wildcard can both be casted to each others' types.

Object box = (Box<?>)(Box) (Box<?>)(Box) ... new Box<>();// Valid (without the ellipsis)

So why is it that my List of raw boxes can't be cast to a List of wildcard boxes, and vice versa? (Any documentation that is responsible for the compiling error the following code raises, would do if you can find it.)

List<Box> rawBoxes = new LinkedList<>();
List<Box<?>> wildcardBoxes = new LinkedList<>();

Object o1 = (List<Box<?>>) rawBoxes;// Cannot cast from List<Box> to List<Box<?>>
Object o2 = (List<Box>) wildcardBoxes;// Cannot cast from List<Box<?>> to List<Box>

"Cannot cast from List<Box> to List<Box<?>>" and vice versa...

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Before you answer/mark as dupe...

I'm guessing that someone is going to try and bring up the fact that a List<Dog> can't be cast to a List<Animal> and vice versa. The reason for that, however, is:

List<Animal> animals = new LinkedList<>();
animals.add(new Cat());

Dog dog = ((List<Dog>) animals).get(0);

A list of Dogs is not a list of Animals, because it can only contain Dogs.

With a List<Box> and List<Box<?>>, any sort of Box can be put into either:

List<Box> rawBoxes = new LinkedList<>();
List<Box<?>> wildcardBoxes = new LinkedList<>();

Box rawBox = new Box<>();
Box<?> wildcardBox = new Box<>();
Box<String> stringBox = new Box<>();

// They can both take raw boxes
rawBoxes.add(rawBox);
wildcardBoxes.add(rawBox);

// They can both take wildcard boxes
rawBoxes.add(wildcardBox);
wildcardBoxes.add(wildcardBox);

// They can both take boxes storing arbitrary stuff
rawBoxes.add(stringBox);
wildcardBoxes.add(stringBox);

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Lastly

This came up, which tells me that such a cast would be safe, if Java were to allow it. What I want to know is why a cast from List<Box> to List<Box<?>> isn't allowed and how to get a List<Box<?>> off of a List<Box>.

If there's another question that will thoroughly answer both of these things, please mark this as a duplicate. I didn't know exactly what to look up when searching for an answer myself.