Good for you taking these grey into your life, follow Daves' suggestion to get started on the right foot with them. Give them time to adjust once they have been Vetted since they have not been out of that house in so many years it will all be a huge change for them. A big new world to get used to new person, new home and possibly new cages, toys and food. Just go slow approaching them, have low expectations for interaction to start with and let them show you what they like and what helps them feel safe. We are all here and ready to help both you and the birds. Welcome to our rather Grey world.