Facebook User complaints

[Samir Abid Al-mahdi]

Dear Experts,

We as an ISP doing NAT logging for legal obligations and we are receiving
complains from courts with our IP address being used by the attacker.
however, our logging methods needs a source ports to trace the users behind
this IP address. Are you aware of any services such as facebook customer
service that provide such information upon an official request.

How are we supposed to answer such offical request as an ISP if the
complaints are without source ports.
Best Regards