Alex:
A number of goods -- about 10 items total -- have been stolen from Warehouse Keeper Sonin's warehouse.
During my investigation, I narrowed the list of suspects down to 5 creatures: Delu Lizardman Suppliers, Special Agents, Commanders, Shaman and Cursed Seers.
Find the thief, recover the 10 Stolen Cargo items and return them to Sonin.
Then I am sure he will, in gratitude, provide you with the letter of reference.
Go back and hear the other problems.
Let Alex know you understand the problems of the townspeople and are ready to begin helping now.