Looks like a posi ( clutch pack ) to me, look in from bolt side of ring gear at axle splines, should be two sets on that side. Possibly very little if any damage to the posi unit while without
oil unless you were working it hard in corners etc, but a total stripdown will be needed to check it out. Bottom line, New R&P plus all five brgs & seal, along with check of axle brgs just to be sure.