That's a tricky one. We've got third-hand claims SBIRS saw launch and impact flares, but as with MH17 that's not going to go public even if true (and even if correct, it's not evidence that's interpretable by the public anyway). Ukraine has the same investigators on the ground as with MH17, and they are unlikely to just shut up if told to do so. Even if they do get thrown out and all collected evidence confiscated (a tacit admission of guilt anyway), there's enough public photographs of the site on the internet that reconstruction from photogrammetry is also an option. If someone f-ed up and set Tor to full autonomy near an airport (or just as bad, staffed the command unit with people who just hit the button when the alarm goes off) there's no real way that can be concealed in the long term.