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Thats good that he seems happy and healthy. I would really advise that he needs to be eating some solid/wet food before he goes to his new home.
There is a chance if he goes to his new home not being able to eat cat food it will be very stressful for him and he may be at increased risk of tummy issues or weight loss.
How you can help him:
Good luck, feel free to let me know how you are getting on.