FWIW, my proposal for #1 (pretend to be a crew making a misdirected delivery) was not to bluff "our way inside," at least not directly, but to lure those inside out to see what the "mistaken delivery" might be. A conflation of #1 and #2 if you will. A deceptive distraction.
So my 'vote' as it were is #2 with a side of #1.
PS Also had thought of trying to put fire arrows into the skiff (the smaller boat) from atop the warehouse roof, but GM properly pointed out that it has been raining for about a 24 hour period.