Anything that is game used will say it on the card somewhere. Most non rookie year game used are actually "game used", rookie year its usually stuff form the rookie premiere shoots, therefore usually classified as event used. Patches are parts of the numbers/names/logos. Usually 2 or more colors, but some companies believe 1 color is just fine, lol.
Manufactured patches are not game used, they were made specifically for the card company to make cards with.