Pictures? How much did you pay? Where did you buy it? With the limited amount of information you've provided I would say...
Unless they are aftermarket scales, it's a fake. If someone was selling a PM2 with custom scales, that would be something that you would think they would mention, as that makes it worth more. Some premium scale materials are pretty expensive, and sometimes cost more than the knife itself. Usually when you buy a knife with custom scale, people tend to include the original scales, because most of the time they have no use for them, since they're selling the knife. With that being said, if you bought it as new, and they didn't mention the custom scales, and they didn't included any original scales, then I'd say it's a fake.