Did I buy a fake Sonic Blast?

[tap]

About a month ago, I purchased a complete copy of Sonic Blast off of eBay from a seller in Brazil. The game arrived, played fine, looked fine, etc. Appearance-wise, everything about it (at least on the outside) made it look like a 15+ year old game. The insert appears aged and has marks on the white backside that would indicate it has been inside a plastic case for quite some time (I've seen similar markings on some of my old PS2 games). The manual also appears to be of a similar age.  

Then, today, while I was looking around on eBay, I saw someone from Brazil selling a rather convincing looking conversion of Sonic Triple Trouble done up as a Tec Toy release (no mention was made of it being a conversion). It was just a cart and case with a printed insert, no manual.

That got me thinking about the Sonic Blast I had bought. I looked up the auction and discovered the details for it were no longer available for viewing in my purchase history, despite it only being about a month old. Then I saw that the seller was no longer on eBay (no reason was given for him leaving). All of this has left me feeling rather paranoid of my purchase, so I opened it up.

My only other Tec Toy games have what looks like glue in one of the screw holes, so I can't open them for comparison.

A sticker appears to have been removed from inside the cart shell:

i87.photobucket.com/albums/k131/Taylor_Pinson/DSCN1078_zpsq8wvhter.jpg

There is a sticker on the back page of the manual, but this has got me thinking they could have just taken that one and applied it to a reprinted booklet.

The board says Tec Toy, but the chips say Sega:

i87.photobucket.com/albums/k131/Taylor_Pinson/DSCN1076_zps5sxirhxo.jpg

There's some brownish stuff on the back of the board around the capacitor:

i87.photobucket.com/albums/k131/Taylor_Pinson/DSCN1077_zpsdwzkxp25.jpg

Is that a bad solder job, a ruptured cap, or something else?

What's the verdict?

[Maxim]

I think it's genuine. The MPR chip is very hard to fake.

[flatapex]

If something looks to good to be true, thats when you need to worry.

Loads of people deactivate ebay accounts, they typically do it for one of two reasons:
1. normally very good people with a complaint against ebay (if you are below standard, they won't delete)
2. don't want to use paypal (it isnt widely used in brazil)

Fakes are usually made to look as perfect and new as possible, because thats where the money is, the repro you discovered would have no manual because they are a pain to make, covers for example are basically printing a pre formatted scanned file

[playgeneration]

It's an 8 megabit game, so can't be simply put on common donor game board. It's genuine in my opinion.

[tap]

Good to know the game is probably legit.

Any idea about what that splotch is on the board? Is that something I should be concerned about from a maintenance perspective?

[Sinistral]

I'd say the brown stuff just looks like leftover flux. As long as the cap isn't domed or burst at the top it should be fine.

[Maxim]

The capacitor was hand-soldered, maybe originally or as a repair some time later (e.g. repairing the ones that rattled after shipping to Brazil). Nothing to worry about.