How can I tell if a Vintage Gucci bag is real?

Well, First of all was it a gift, if it was are they weathly or avrage and are the close to you? Next, do you have the recipt or proof its real?? do you have the box it was delived in?? next, inside does it have the label and "made in ____" about 60% of gifts that are bags are fakes but if it looks good why bother when you can just say its real!! hope this helps xD