Juni, go to the pet store or the vet and get some cat drugs. You can get spray on ones which you just spray the area with, or plug into the wall ones that release a scent.
When we added another cat last year one of our originals went nuts and I mean absolutely fucking crackers doing all the things you're suggesting and more.
It's basically a pheromone that calms them down. Well worth the investment.
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Kind words are the music of the world. F. W. Faber
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