The testimony of Job ought to be sufficient for us to trust that God is well able and ready to bring us through the valley of the shadow of death, restoring us as much as we are willing to take care of. He got twice as many of everything, so had to have trusted shepherds, his army of servants fully restored.
We don't know how many people lived in Job's day who knew Adam and Eve and probably their children. It was likely everyone knew someone of close relative position, kind of like living in a small town in the USA, where "everyone knows everyone". They had knowledge of good and evil from the start, the extent of which perhaps we today have lost sight of some, replacing some good with the abundance of evil, taking on attitudes like the three friends of Job, even sounding "good and true". Our hope is grace makes up the different to spare in eternal value. I believe sin has so diluted the knowledge of God that we naturally find the revelations of Job are mysterious as to origin, some only verified by science recently, some partially explained by the apostles and whatever the Holy Spirit has revealed since their days.
How he got what he had isn't so much a deal as who he had as his only friend....God. Even his wife gave up, but not God. I have one true friend left besides my wife, a man I know and understand well, a person I will and have done whatever was needed. I am outliving my friends among men, but Jesus is always my friend and my savior, knows me, and did the ultimate of anything friend to friend, and to the whole world of those who should believe on Him.
When I study Job I am reminded of Jesus' earnest and mind-boggling, troublesome prayers in
Matthew 26:38-44 (KJV)
38 Then saith he unto them, My soul is exceeding sorrowful, even unto death: tarry ye here, and watch with me.
39 And he went a little further, and fell on his face, and prayed, saying, O my Father, if it be possible, let this cup pass from me: nevertheless not as I will, but as thou wilt.
Notice His first words, "O my Father". That's my model, my first recourse to dealing with my troubled soul.
40 And he cometh unto the disciples, and findeth them asleep, and saith unto Peter, What, could ye not watch with me one hour?
41 Watch and pray, that ye enter not into temptation: the spirit indeed is willing, but the flesh is weak.
42 He went away again the second time, and prayed, saying, O my Father, if this cup may not pass away from me, except I drink it, thy will be done.
43 And he came and found them asleep again: for their eyes were heavy.
44 And he left them, and went away again, and prayed the third time, saying the same words.
He owed Job no less.