Sunday 20 May 2012 6.57am
It's the sender who has to claim for compensation not the recipient. This might be what they mean when they tell you that they offer no compensation.
All signed for international mail being sent from the UK comes with a certain amount of insurance. It seems likely that the same is true in Germany, but you'd have to get the sender to lodge a complaint in Germany.
Here's the relevant quote from Royal Mail's website:
International claims for loss and damage
Please note that we are only able to deal with claims where the item was posted with Royal Mail. If an item has been posted with or handled by another postal operator, or sent from outside of the UK, it will not be eligible for compensation from Royal Mail.