Let's talk counterfeit money

I just sold my camera to someone off FB marketplace. He paid a good price for it and genuinely seemed interested in photography and sent me samples of what he was trying to go for and everything. Of all people he was an offshore baw from Houma who I guess decided he wanted to be a little artsy. Well we arranged a meetup and I showed him the camera and how it worked and gave him some tips and he gave me a few hundred dollars cash. I'm walking to the bank down the street from me to deposit the money and I admit after holding it a bit it kind of feels a little flimsy. I also don't usually carry any large amounts of cash on me so I barely know what these newer $100 bills look like in terms of watermarks/holograms/etc...

Well I get to the bank and use the ATM and figure if it accepts it it must be real cash. it deposits the money just fine so I assume I'm in the clear. I considered going in but I didn't have a mask on me and there were a few people headed into the bank who looked like they may be at risk. I have the guys vehicle description, pictures of him (if he used a fake facebook profile he used his own real pictures) and based on every stereotype I know about the place, he really is from Houma. Drove a brand new Tundra (likely on a 96 month lease), basketball shorts, sperrys, costsas, you name it.

My question is would the money have been accepted at the ATM if it was fake? I have screenshots of our conversation going back about two weeks as well as conversations with fellow employees as well as relatives that I was planning on selling the camera today and for the exact amount that I deposited. I'm hoping that should it be fake, I have enough evidence to show that I was given counterfeit money and not that I myself am a counterfeiter. Does anyone have any experience with this happening to them?

tl;dr: I sold something and was given cash in return. thinking back on it the money felt flimsy but the ATM accepted the deposit. How fricked am I?


ETA: His name on his facebook page is most likely real. His name lines up with South Terrebonnes graduation records from 2015. So his approximate age fits too. I've also got his cell number that he called me from.