Interesting replies, thank you all 
Basically the views are varied. Some people think personal delivery is the way to go, others think using a courier service is better.
In that case it should be combined with some kind of escrow service.
As I have seen, a 1 BTC Casascius coin is worth more than 1.4 BTC so that is already more than 10.000 euros.
So I would not take any risk. Is there any regular mailing service with an insurance for that kind of money?
And it is true, personal delivery carries a certain risk too.
Meeting in a police station - an original idea
Basically the views are varied. Some people think personal delivery is the way to go, others think using a courier service is better.
In that case it should be combined with some kind of escrow service.
As I have seen, a 1 BTC Casascius coin is worth more than 1.4 BTC so that is already more than 10.000 euros.
So I would not take any risk. Is there any regular mailing service with an insurance for that kind of money?
And it is true, personal delivery carries a certain risk too.
Meeting in a police station - an original idea