Originally Posted by
SocialAdept
Relax. This is just a formality issue the carrier needs to put in print. As mentioned in the thread this is a non-issue in practice.
If you have an instrument worth tens of thousands USD/EUR/GBP, anecdotes about somebody getting away with it are not enough. You want to be 100% sure the instument will be accepted as hand luggage, as checking is simply not an option.