You might still be able to do this quest if you have the items or can use the console to unlock doors. I suspect the warning about having not finished the siren deception is because the door to their house lock 100 at the end of the sirens quest.
I think I will test this theory.
edit. Yep that is the case; As long as you have the item or can get them by using the console to unlock the door, the Quest will work.
The assumption at the end of the quest was the guards would "take care of everything" and want you to leave. So really, all that needs to happen is for the items to disappear if you ever returned. Honestly I just thought they should be worth something and not "0 gold" and marked as owned if you are going to steal them and sell them. Heh, if this gang was stealing stuff, you think they would take something of value?
The Sirens Deception is a quest where you end the reign of terror of a gang of women. This mod just an add-on for that quest if you want to return their stuff..
Besides, in the actual lore no one knows that they did that. So they can't be shamed for something no one knows about.
Ok got round to downloading this mod and checked it in Tes4Edit, it has 10 ITMs and 0 UDRs when running the clean process on it:
BOSS Masterlist Entry Return the Stolen Items.esp IF CHECKSUM("Return the Stolen Items.esp", 5BE073C1) DIRTY: 10 ITM, 0 UDR records. Needs TES4Edit cleaning: "http://cs.elderscrolls.com/index.php?title=TES4Edit_Cleaning_Guide"
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I think I will test this theory.
edit. Yep that is the case; As long as you have the item or can get them by using the console to unlock the door, the Quest will work.
Besides, in the actual lore no one knows that they did that. So they can't be shamed for something no one knows about.
BOSS Masterlist Entry
Return the Stolen Items.esp
IF CHECKSUM("Return the Stolen Items.esp", 5BE073C1) DIRTY: 10 ITM, 0 UDR records. Needs TES4Edit cleaning: "http://cs.elderscrolls.com/index.php?title=TES4Edit_Cleaning_Guide"
Will also post this data to the BOSS nexus page.