Zam zam

Receiving somebody else's Zam-zam at the airport

Q: On returning from hajj, many people’s Zam-zam did not arrive. Thereafter, when we reported the missing Zam-zam, the airport authorities gave us bottles of Zam-zam equal to the number that we were supposed to receive. However, the Zam-zam they gave us is not ours, and a few bottles have other people’s details on them. 

It seems that the airport authorities are giving random bottles of Zam-zam to random people who claim Zam-zam. Is it permissible for me to keep the Zam-zam they gave me?

Packing Zam Zam in one's bag when returning from umrah or hajj

Q: When coming back from Hajj/Umrah, Saudi has a rule that each pilgrim may only bring with him 5 litres of zamzam, packed in a special box. People say that the reason for the rule is that they want to avoid water packed in normal bags from spilling on the luggage bands. If a person secretly packs extra zamzam in his normal bags, will he be sinful for breaking the 5 litre rule even if he packs it in a way that he is sure there is no leakage?