How to tell what pack a yugioh card came from?

So, a while back I bought a bundle of 500 yugioh cards. I took out three of each of them to keep, and was left with 208, which I plan on selling. I'm using the YGO prices app on my iPhone to track prices, but I've run into a slight problem. Some of my cards, like battlin' boxer counterpunch, could come from different card packs. Counterpunch could have come from the 2014 mega-tin mega-pack or Lord of the Tachyon Galaxy. I normally wouldn't care, but the prices are varying slightly, and I don't want to rip someone off if one is more valuable than the other. So is there a way to tell what card came from what card pack, or does it not really make a difference?

Look at the Set Number. It's the alphanumeric sequence typically under the card image in the bottom right.

The general format for set numbers is "SET-LN999", where "SET" is the two-, three-, or four-character set abbreviation, "LN" is the one- or two-letter language/region abbreviation, and "999" is the set card number.

According to http://yugioh.wikia.com/wiki/Battlin%27_Boxer_Counterpunch Battlin' Boxer Counterpunch has two possible Set Numbers in the English TCG:
LTGY-EN020
MP14-EN006

LTGY means the card came from the Lord of the Tachyon Galaxy pack.
MP14 means the card came from the 2014 Mega-Tin Mega-Pack.

Other Set prefixes can be looked up at http://yugioh.wikia.com/wiki/TCG_Set_Prefixes

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