I remember an airline colleague Wilf who had been on Vulcans tell me about the aircraft that diverted to Brazil. He said that once they landed the Nav tried to burn the charts but due to the plastic coating they would not burn. He also said that when the crew had been released the crew wondered where the Shrike had gone and they found that the Brazilians had boxed it up for them . It all could be bar room chatter but it had a hint of reality at the time.