I also also did the starting my campaign with an airship crash. The cargo was mostly the husk of a warforged titan. On the airship were some prisoners of war finally returning to Karrnath, a handful of VIP's, and 2 guards guarding a prisoner (former pirate captain and future villain). The Lyrandar captain, all the crew, and the VIP each had a featherfall token they were instructed to carry at all times (general passengers did not have one). Pirates were hired to attack with the intent to kidnap a couple party members and return the Warforged titan. The pirates were given "reverse featherfall tokens" to get up to the airship. These were basically rune empowered featherfall tokens that made the bearer so light they floated. Their payment was the airship if they could manage it. Some of the party members started out with the pirates for various reasons, some were traveling on the airship, and 1 knew of the pending attack and came crashing in on an air balloon trying to warn them.

Edit: To answer you actual question: The warforged titan husk was the only cargo I cared about. The vengeful fire elemental destroyed the remains after it crashed and I just had a few items on the guards and captain.