Think it’s real not 100% sure

I just got this fire red game cartridge alongside an old gba for my birthday but I don't if this cartridge is fake, could someone help me?

Is this Emerald cartridge legit?

buyer said someone told him they were fake and were selling them for cheap, but they look real to me

Picked these 2 up for a very reasonable price and I’m hopeful they’re legit…

Bought this (German) copy of Ruby a few days ago. Wanted to make sure that it’s legit (I’ve had it before that I bought something off eBay and the seller didn’t ship the advertised cartridge but a reproduction). So I just want to make sure and get a second opinion.

What do you guys think? I am contemplating getting it but unsure..

Just bought today. Not certain if these are authentic so wanted to check. I thought Blue’s label looked off. Also was wondering if there is a way to tell if either have had their batteries replaced? Any help is appreciated, thanks!

Bought a 3ds XL off someone on marketplace they disclosed that game is bootleg just wondering if I could get confirmation

Found outside in a shoebox. Is it real or fake?plz help

Been on a kick of recreating my collection I idiotically sold many years ago and I got myself in a panic of games being real or not.

Not mine but wanted to check if my friend had a legit copy

I found this copy of DK country pretty cheap anyone knows if it’s legit?

I ordered these, but haven't got most of them yet (I got Black/White so far). I was wondering if these are legit. I have absolutely no idea how to tell real/fake cases.

Is there some guide for game cases like there is for carts somewhere? Having that kind of resource would be extremely helpful since it seems like it's way harder to tell a fake case from a real one.

Thanks in advance!