How to know if these pups are in good health?

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So I posted a want ad for a AKC registered, dark sable German Shepherd puppy and a gentleman responded. He texted me a 1 month old picture of the two puppies he has and he told me that he'd take and send current pictures today. He says that they are AKC registered, have had both rounds of shots, and are fully dewormed. He doesn't exactly live close so we're meeting half way when we do meet, but it's still at least a 2 hour drive. We haven't scheduled when yet.

What information can I ask of him to be absolutely sure these are good, healthy pups from a good lineage?

Thanks!