Just bought a ‘18 Odyssey, there’s water in the trunk. Mold?

Just bought a 2018 Odyssey with 55k miles. Very clean car. After owning it for a couple weeks, I removed the rear floor well liner to vacuum, I noticed there’s water collecting there. I’ve seen the posts about this and know it’s a common issue.

My question is, I’m sure this was an issue long before we bought the vehicle. The carpet smells musty back there and I’m concerned of the possibility of mold. My 3 and 6 year old spend a couple hours a day in this car. Has it been leaking back there for months? YEARS?!

-Is there any way to test for the presence of mold?

-is there any carpet and pad east to remove for drying it out?

Im getting a call back from the dealership I purchased it at. What should I expect? Can I demand anything?

I paid $28k for it, tax, title, extended warranty, etc…. $35k out the door. $35k is a lot of money to be sealing your roof with a caulking gun a month later.