"Ah, steal the goods as or just after Luskanites purchase them - drain enough of their resources that way and not only will they think Neverwinter is cheating them, but we can possibly get one of our number to re-sell Luskan the stolen goods to increase our take somewhat on this endeavor."
"Hmm... I can even leave behind some magic auras to make it look like the goods were whisked away magically, or never truly there to begin with...."