You may have to produce a document stating where you bought it. And it depends on the country. Customs at many European airport doesn't check incoming luggage at all. In most Asian countries all your luggage has to go through X-ray machines. If you carry something very expensive and you are not a resident you have to fill out a form and they will check that you take it back out when you leave. If you are a resident you better get a sticker at the airport when you take the item out on your trip. That won't apply if the item is obviously not brand new.
I am sure in India they check very diligently, otherwise a lot of people would handcarry items and resell them.
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