Alright, I'll try to do it in a short story here.
About more than 1 mounth I was around Kijiji (Canadian seller/buyer website) and saw an Earthbound listed as an excellent shape for $140. I jumped on it and bought it to the guy paying by Paypal. After like 2 weeks I still didn't received the game, and I saw he relist it on Kijiji. So I contact the guy and he told me it was a mistake (The listed game was his game, and the one I bought was one from his friend or something) and the game was going to be shipped for real since it was his friend who had it and he had some problems or something. Then 1 week after (3 weeks from when I bought it) I write to the guy saying I didn't received it. No answer/no game 1 week after I contacted him. So I sent him a warning message saying I'll active a dispute through Paypal if he didn't refund me.
Surprisingly he answer me pretty quickly this time saying something weird about his friend had the cart and it was a mistake again and he was going to shipped it to me.
So I just received the game today. When I opened the package and take the cart in my hands I already feeled like it's had something weird. Label was too beautiful (really shinny really looking like a "like new" condition). Label looks also like it's a little blury like if the printer isn't that neat. The fake label have also some kind of «waves» on it (check out pictures below). I compared the fake cart whith a real cart I already had and found some differences between the 2 carts, so I already knew I had a fake cart or something. I tested it in my Snes and it worked. Then I tryed to open the carts to see the differences between the 2 and guess what? The fake cart have some glue on one of the screw, so I can't open it. Also it looks like they "damaged" the label a little to make it looks like more legit, but it still looks too "fresh and new" to be real.
Edit: I just noticed about a different color for the top label EarthBound writing. Pic added
Now I wrote to the guy saying him he sent me a bootleg and I want to get refund today, if not, I'll active a dispute through Paypal.
So if anyone have some opinions/similar stories about EB snes that can help here feel free to post it, I'll be glad to have some opinions/help.
Here's a screen shot of the add I took in case he put it down.
And here's the differences between the 2 carts:

I don't know if it means something here but the back label for the fake cart say "MADE IN JAPAN SNS-USA/CAN-1" and the one from the real cart say "MADE IN MEXICO M / SNS-USA / CAN-1
Here's the screw that got "glued"
Wavy sticker
(FAKE CART)
Different color for the top label EarthBound writing.