One way to check for sure is to examine the item. If no special dialogue box comes up offering a quest, then it is possibly vendor junk.
Keep in mind that some items can also be used in tradeskilling. You might check
here to see if it's a component for a recipie or quest. If is dings as a special rare find, sell it on the broker for a nice profit. If you're a tradeskiller, than you could use that rare item for spells and items.
Even though some items are not quest-givers themselves, it might be needed as a component by some quest. For example, a Palladium Torque and Fulginate Girdle are normal (but rare) loot drops, and required items for quests. The torque will sell for over 1pp at the broker, or it can be fashioned by a artisan. That route may cost you 1.5pp. I just sold a Fulginate Girdle for 55g.
By the way, deer meat is a component for a Heritage Quest,
Teachings of Yoru. You could sell it for at least 20+ silver each, maybe more.