Alabaster seemed wary handing this one out to the party, as it is dangerous and the party has not quite proven themselves as of yet.
Regardless, there have been Goblin attacks on caravans, traders and wagons as of late. The Goblins seem to be very careful and particular about whom they attack. Alabaster wants the party to track down where the Goblins are striking from, and where their camp is. Not attack the Goblins head on.
Should the party locate the Goblin camp, and Alabaster can confirm the location, the party will receive 100 gold.