That is one of several reasons that I only board Jasper at her vet's. Any bird who board there has had an examination before boarded and she has immediate veterinarian care if she needs it. Besides the techs and admin crew spoil the heck out of her and carry her around most of the time. She has been Dr. Drigger's patient for 21 years.
That's what I've always done in past, vet boards them....or I have a trusted person come in at my house and watch them and care for them. Everywhere else I don't trust. Just not worth it.