Carrier's right to check sender data requires mutual agreement and cannot create an unfair advantage.

The court ruled that while a carrier has the right to verify data provided by the sender, including package dimensions and weight, this verification process must be mutually agreed upon. The carrier argued for the right to inspect these details, but the opposing party contended that unilateral actions would disadvantage the sender. The court decided that such checks cannot be imposed unilaterally as they would place the carrier in a privileged position without balancing the sender's rights.