Well, some of those leaves do not look well, why not remove them?

Looks like mechanical dam, but if the damage is organic, then I recommend removal. The plant has enough growth, removing damaged leaves may not be noticed.

What size container, and what planting medium?

It’s probably outgrowing it’s container. Would that make the leaves look that way?

It looks like C.o. Crosby's Compact , is it?

It looks as something bit off chunks of leaves. Where inside is it? I would guess a mice. They can get inside. When I lived in 'big city', there used to be mice around. I started to leave a nut (peanut, almond or any I happened to have) around. If it disappeared, I knew there is a mouse (or few) around, and set mouse trap. I have been living 'in the country' for quite a few years, and didn't catch a mouse inside the house yet...I still leave nuts around - just a habit :)

I get similar damage on some of my succulents outdoors, mainly done by chipmunks.

Outgrowing the container would not cause that kind of damage.

If I may suggest, your plant is not receiving enough light. If you look at branches, they are all leaning toward source of light. And they are etiolated - sets of leaves are far apart. Plant receiving enough sunlight will be compact:

Leaning could be 'fixed' by turning the pot every couple of weeks or so, allowing all sides to receive same amount of light. Or putting a light directly above. Etiolation can't be reversed, and only enough light will prevent it from happening further.