It's now the 27th, or 25 days minimum after the ban on Chinese nationals. Unless there are a whole bunch of asymptomatic carriers, which would mean a whole bunch of cases popping up, I don't think we need to look at those 20K.
So that leaves three groups:
Chinese married to US citizens that were allowed in after the 5th,
Chinese who 'beat the system' by staying in Singapore or Japan or Dubai, etc., until the 14 days from mainland china restrictions were expired, and then flew into the US.
Or, travelers from other than China flying into the US before we added their countries to the list of countries requiring enhanced screening (Taiwan, Singapore, hong kong, Japan, etc).
Customs and BP need to run their databases and locate these folks' destinations within the US
p.s, I agree completely that you don't want your neighbors to know you're preparing or that you have provisions. Not that one's neighbors might be a threat, but they tell someone, who tells someone who tells someone...
We agreed to take in one person as she saved my wife’s life once. Other than that, I’ve only talked to one fellow prepper at work. Neighbors-nothing although they (and especially delivery men) may know that I’m up to something, with delivery trucks (UPS/Fedex types) stopping at my house daily (often more than once) for the past month, so I worry a bit there, but hopefully they don’t pick up on it.