Check out the edges of the bag. Original leather bags will always have rough coarse edges while bags made of faux will have almost perfect edges of plastic or something synthetic.
Imperfect surface screams Genuine Leather Bag
Does the surface of the bag feel like pebbles or grainy? Real leather has an inconsistent pattern with minor imperfections. Fake leather is uniform with evenly spread pores which shouts fake! Moreover, real leather is made of natural animal skin and has uneven pores like ours.