Rabbits don't eat?

Hello there,

I've had two rabbits live with me since last Friday (5 days). They're 10 months and 1 1/2 years old. They live on my balcony, but unfortunately, in their old home, they live in a wire cage and in the conservatory. Unfortunately, they don't eat enough; the vegetables/greens, etc., are usually almost full, and they only eat a very small amount of hay. I keep seeing them eating, but I have the feeling it's far too little. This morning, I found much too small droppings in the cage. What should I do? Is it because of the stress? Do they need to get used to it first? Or is it too cold for the little ones?

I would be happy to receive any answer.

Best regards,

Frodo, Rosi and Anna.