if you go in through the spiders lair its the back entrance to Bohdi's lair. cuz you said the door from the outside is barred.. then once you leave the barred door will stay open
i've played BG2 twice so i know from the thieves way you can get into the lair through the spiders entrance and when i worked for bohdi i got the shipment box and braught it back to her so you might have a bugged game
hope this helps some
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