fwiw, I have an addin (works with 10.2.x/10.3.x) that can look at all the mxd in a folder (and subfolders), provide a report of all broken links and allow you to update a .csv file and then fix most (if not all) of the broken links). Always do a test on a copy first...but, in case you are interested
Python addin for data inventory and “broken-link” repair.
Not perfect, and may not be work the effort for just two mxd docs...but if yo have a lot, or if machines/paths change, may be worth it.