The openness by pro-Russian separatists was a contrast from Sunday, when OSCE representatives received a welcome that spokesman Michael Bociurkiw described as hostile.
"Today we have three Dutch forensics experts with us, and they're getting pretty much unfettered access," he told CNN, noting rebels also provided a security perimeter to keep journalists at a safe distance.
OSCE monitors and people described as aviation experts from Ukraine are currently at the scene near to town of Hrabove, where the Boeing 777 fell from the sky last week, apparently shot down by a surface-to-air missile. The crash killed all of the 298 people aboard. The remains of 282 have been found; refrigerated railroad cars near the crash scene are currently holding 251 of the bodies.
Forensics experts from the Netherlands, where the flight originated, are "more of less" satisfied with the improvised storage of the bodies, Bociurkiw said.
Fighting between Ukrainian troops and separatists continued in the city of Donetsk Monday, with authorities reporting damage to a residential building and a fire at a market near the city's train station.