There is no way to showing fake/manipulated volume because its not listed cmc or coingecko.
What do you mean?
p2pb2b can be found here
https://coinmarketcap.com/exchanges/p2pb2b/while bcnex is here
https://coinmarketcap.com/exchanges/bcnex/and though there's no data yet but you know when it's faking or not, one good example is when they are not allowing your to withdraw right away.
How can they have a great volume when they can't provide liquidity.