Dealing with the siblings after the parents' death

You can get rid of the furniture, then consolidate the boxes in (hopefully) one unit.
If the furniture is in decent condition, you can donate it to a charity that picks up donations (and you can schedule the pickup for the date convenient to you). Let all the relatives know about a month prior that your plan is to get rid of the furniture on X date, so they have an opportunity to come get the items they may want, but don’t let it drag on.
Regarding the scanning - no, you should not be doing the scanning for other family members. If they asked, you should have said no.