Well, but it's a really good idea to take a new keet to their "new keet checkup". The purpose is so your vet gets a baseline reading so that if you bring your keet in later with a problem, the vet knows what to compare it to.
Also, any time for example that you buy a used car, you always take it to your own mechanic, no matter what the salesmen say. The purpose of a salesman is to make the sale. The purpose of an owner is to protect the health of their loved pet
We have many reports of pet stores - including PetSmart - selling diseased keets, sometimes without knowing it. The only way they might find out they have a mite infestation for example is if owners like you get their vets re-checked by someone else that catches it.
Any new pet I get - cats, keets, etc. - always go to the vet to get that initial checkup for health reasons. If there's going to be a problem you want to know about it sooner rather than later, so you can nip it in the bud.