Swamped

You don't see an opportunity, so you do the best you can and mentally go over the potential holes in your cover story. Best to anticipate what this bounty hunter might ask about... and indeed, they have a question almost immediately.

"And just who are these employers?"

That's an easy one, of course. You can even be honest about the Guild's methods, if not your current role with them.

"They don't like us to say it directly. But I can say they have, shall we say, influence on more than a few bounty boards. Might be hard for you to stay in business if you get on their bad side."

"You threatening me?" the hunter asks.

"Me? No. I'm just a lowly courier, they don't give two craps what happens to me. But they do care if one of their big jobs falls through."

"How exactly were you planning on meeting up with them to deliver the goods, then?"

"There's a meeting place, I send a signal when I get there, then I wait for my contact to arrive."

"What place? What signal?"

Hang on. You did come up with those details... but if your story were actually true, and you told them those things, they'd be able to shoot you, take your stuff and then replace you at the meeting.

You could confront them directly with that point, but maybe it would be better to discourage them a little more subtly.