Four members of the Dutch investigation team went back to the crash site yesterday, under the cover of the OSCE monitoring team.
Dutch return to MH17 crash site as search resumes - Channel NewsAsia
Some stories on this will tell you there is fighting still going on nearby. This is not so. The closest fighting has been more than 80 km away for more than a week. The OSCE has been freely moving around the area for weeks and issuing daily reports, mostly of small protest groups facing off with verbal-only insults, or counterpoint commanders alleging shelling which the OSCE could find no marks of.
They are trying to recover personal belonging, the majority of which has been collected and stored by the locals. They may also look for a few damaged sections to take back, if they've identified ones of interest from the photos.