You lost 8 of them, when was first time you let them out, they must have been quiet an age? Sorry to hear of this mate, you'll have to be alot careful with snowys birds as they look old or older young birds and im sure will need to be broken out so possibly when you let them out thats if you are going to they might end up back at birmingham! Best of luck mate, remember your loft is only 6 x 4 so be careful not to over crowd