Hennessy vsop and martell vsop does not have a code to identify whether it is fake or original. The best is to buy from authorised wholesaler. If you can get duty paid hennessy vsop below rm160 it is probably fake because moet hennessy just had a price increase in march. Martell vsop below rm140 is fake.

There are alot  of fake brandy n whisky outside and ppl who sell fake usually will tell you it is stock from custom or langkawi and etc. try to avoid buying from ppl who dont have a shop and deliver to your door step. Buy from authorised distributor to avoid getting fake stuff.

As the bottle you cant really tell the difference because fake liquor will use original bottle to refill. best is to look at the seal and original seal is very tidy and neat.