I'm sorry your wife had to give up the cat, but good for you both for reuniting a lost animal with its owner.
Maybe it's time to visit the shelter? Maybe you don't need another pet.
Several years ago I lost my buddy Toby to an early death from Lymphoma. I had adopted both him and his sister from a feral colony as kittens. He was only about 6 when he passed and I was devastated. A chance visit to the shelter produced Oliver. Tilly took to him quickly and now they are buddies.