If the CB auditor needs to verify new ISO 9001:2015 related clause implications like e.g. "risk based thinking", it may well be now, that the CB auditor WILL need to verify deeper location facts finding, taking your example, IF the verification in person is the ONLY way to do so, as maybe the documentation evidence has not been provided to full extend of verification satisfaction by the headquarter. But the Stage 1 CB audit would maybe bring clarity for that question. Plus in these days, Skype meeting with location manager and team with CB auditor at headquarter Stage 2 CB audit which might be in foreign country might be possible as well now, who knows...
I recommend every organization to document explicitly the transition process to ISO 9001:2015, as CB need to verify all of the ISO 9001:2015 transition processes, so think about preparing FROM START fo rEACH of your processes something like PEAP's (Process Evaluation Assessment Reports) and such.
Hope that helps and good luck,
Robert Jasper