An-26 altitude is disputed - rebels claim that it was flying within the range of their weapons when it was shot down. Ukrainians insisted on 6500m so that they could accuse Russians and pin it on them. It was a political tussle.
Rebels captured the pilot and even put his interrogation video up on youtube, there was no talk about missiles at all. He probably has long been released in POW exchange. Ukraine just stopped talking about it even though after MH17 it would be very advantageous for them to prove Russian involvement beyond any doubt.
Debris were also photographed by locals and I guess anybody can still go there and take more pictures, especially Russians.