Rookie mistake

[Amy Efland]

I think I made a rookie mistake and need some advice.  I left the building permit (what the inspector signs off on) at the house we are rehabbing and now its gone.  I've looked everywhere for it and can't find it.  I've asked all of my contractors and no one has seen it.  What do I do, I'm assuming I need to go talk to the city building department on Monday.  Anyone have experience with this and what do they typically do?  I am hoping the city keeps track of the progress and what they have signed off on.