I ordered SN from 2 sellers on Amazon Business. Both were fake. As HollowCreek has mentioned, there is still one legitimate source on Amazon only available through a direct link (doesn't show up in search). If you used that direct link, you should be fine. If not, the SN is likely a dud. Either way, always best to test what you get.
If you're in the US, there are other sources for SN. There are threads in the other forum about this, and threads/comments from the other people who also ended up with fake SN from Amazon Business.
Also, I hate to sound mean, but I feel you should know that there are probably very few people who would be willing to give SN in person to someone who's been on the site for only 4 days.
Given that in some jurisdictions, giving someone poison (like SN) with the knowledge that they'll use it to CTB can be considered abetting suicide, it's just very suspicious that you're asking someone to physically give you SN as such a new member. We usually don't even give super new members hints on where to find websites, not until we trust them a bit more.
And why a public place? That makes it sound like you're an officer trying to arrest someone. People passing around things that could get them in trouble tend to prefer privacy. Maybe they'll agree to meet in a hotel room, somewhere neutral with no cameras. But a public place will have cameras. It's dangerous to ask people to pass you SN in a public place. And asking for local fentanyl dealers doesn't help you sound less like law enforcement looking to arrest someone.
I get you're desperate for things to end. You don't deserve to have to be in pain like this, and I'm not trying to minimize what you're going through. You must be in a lot of pain to want the SN so badly, so soon.
But I don't want you to feel disappointed if there ends up being no one willing to consider your request to meet up and give you SN. I'm trying to explain how your request looks from the perspective of those of us wary that pro-lifers and law enforcement are trying to infiltrate this site. I know that may feel a bit offensive, and I do wish you all the best in escaping your pain one way or another. I hope things get easier for you.