Plastic wrap on the straps doesn't necessarily indicate a fake. Believe it or not, they do put plastic on the straps. The boutique just removes it before displaying the bag. Quite a few members here have received their bags from Elux with the plastic still on. However, I believe the bags on Ebay with tissue paper taped around the hardware are fake. LV doesn't do that as far as I know.
There are a lot of things to look for when trying determine authenticity. The fakers are getting better too. There was another member here who found out the Sonatine she carried for several years was fake! From her pics it was really hard to tell. There was only a small discrepancy with the stitches on the handles.