Darion learns that Tolrek and a few others have been acting on his behalf in Vaironian Tides, Chapter 28. Here’s an excerpt:
They’d set about gathering information, putting the pieces together. They’d enlisted a variety of resources; having Fei review a multitude of communications for clues to Meric’s whereabouts, using the state-of-the-art surveillance equipment Tezza and Reya had provided, accepting Makdan’s financial support to pay informants and directing Halsam to make sure that Tolrek was aware of the proceedings, while he was still fighting Ersha.