Posted where the Lost know to look, well in several of those places, is a want ad of sorts.
"Expedient Explorers Employment,
Seeking a crew for a subterranean safari. The tunnels under Funderland are yet to be fully explored. I want to fix that. Many hands make lighter work, but more eyes let you see more to when you explore. So, who will help me?
You should know where to find me."
A cartoonish caricature of an un-Masked Circe is present with the message, as a common "signature" used by the Summer Queen.