Interrogate them

“Alright now ladies, listen up. Just answer my questions and you’ll be off skipping back through the woods in no time. Otherwise I’m going to practice my drum solo skills on your pert little asses.”

The elves continue to squirm a little, trying to at least raise a leg to cover their crotches, but fix their attention on you with resentful glares.

“Did you steal a magic amulet recently?”

“We have no idea what you’re talking about”, the redhead cranes her head over her shoulder to glower at you.

You return eyecontact and pat her on the ass. “Did you burgle the Duchess Selia’s palace?”

“What? No, of course not, that place is incredibly guarded!” one of the other elves replies.

“I just heard you mention robbing someone.”

“Wh- that was just some merchant lady passing these woods. We don’t know anything about burgling a palace!” The redhead insists. You pat her ass again, to her obvious chagrin.

“Do you know anything about the stolen amulet? Anything at all?”

“No,” the elves reply in succession. You can tell they’re a bit confused what on earth is up with these questions.

“Well then, I guess this has been a waste of time,” you conclude. You gaze on the bare-assed trio… You suppose it was not a complete waste of time.