Missing shipment - who can I deliver it to? (act 3 spoilers)

[Skyperson375]

I kept the strongbox from act 1, unopened. Killed all the zhent in Act 1 so the quest is technically closed.

In Act 3, I've just had dialogue where I can deliver the strongbox to one of the zhent in the guildhall. No reward, she just takes the box. Is there anything else I can do with it in Act 3? I read you can deliver it to Danzo the postmaster, but I never had any option to do so despite completing the missing letters quest and reading the letter that linked him to the zhent. I wonder if this is because I killed the Act 1 Zhent, so his 'missing letter' didn't mention the Iron flask - just that the zhent have stopped communicating with him (presumably because I killed them).

Do I have other options?

Thanks

[Jonny Boy]

Most people dont deliver it anyway. Open it and get the bottle. Throw the bottle on the ground in a really hard battle.