Hi guys, i finally heard back from NYC consulate this morning and they sent a request for my passport which is good sign right

(i applied online for an open work permit on Feb 11th). however i do have a question.
i already have a one year multiple entry TRV (expiring in september 2013) and so i don't need a visa which is why i think they're asking for my passport. should i still send it? i know it takes a while for them to answer so i don't know if i should just email asking the question.. or am i wrong and i need to send the passport for my work permit.. i'm a bit confuse and any good advice will be welcome.. thank you