Thanks heaps for your thoughts, Vesna - I have a serial number from the seller, he's given "191839*491403" which is the same as one on Bonanzle by a tPF'er right now. I guess though if they can fake a bag they can make an effort to put the right number on it..... will have a think and do more research, have a couple of days yet. Thanks again!
for some reason they do not, I don't know why, but I haven't seen a fake with right serial number? anyone did ?