I think I purchased a fake Louis Vuitton?

There was this bag on sale on Craigslist for $30. I wanted it but I wanted to make sure it was authentic so I was online forever looking at videos n pictures explaining the difference between a real n a fake. Sad to say, they got me, Im pretty sure its fake. Everything seemed real; the tags, the suede interior, the fact that one side was matching the other, even smelled like real leather! But when I started searching the number inside (RA 1780 003) about a million websites said it "was definitely fake". Now Im devastated n Im not sure what to do.