As far as I'm aware there is currently no way to bypass/recover the 4 digit pass lock for an iPhone 4S.
Cellebrite, XRY or iXam are generally the best when it comes to recovering/bypassing this and none of them have found the solution yet.
In any case given your situation I'm guessing you don't want to spend thousands of dollars for a forensic tool to use once.
If you can't restore from an earlier backup I think you may be stuck
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