It's nice to see someone pursuing a proper quarantine with virus screening! Am I correct in assuming you're using RAL/VetDNA?
Personally, I would recommend a 90 day quarantine minimum, with virus screening on intake and at the end-of-quarantine mark. With the swab-based PCR tests, it isn't so much as getting a false negative as much as the snake just not shedding the virus at the time. Testing your snakes at least twice during quarantine helps account for this.
While a full panel for arena, nido, and paramyxo is arguably best practice, nido is your main concern with BPs. That's the virus that seems to be the most prevalent among the BP trade. It can also spread horizontally (think of how the flu spreads), so one sick BP could easily infect others in a rack system if they aren't isolated quick. This also means that if your new crew has a nido problem, testing around half of them should be enough to reveal it. I would personally prioritize testing for nido if you can't afford to test for everything.
Crypto is more of a gastric virus. If you want to test anyone in that new crew for crypto, I'd test the skinny ones.
Good luck!
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