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5th and reverse gears are on the same selector rail. It is possible that the selector fork has come loose for the 5th gear or reverse. Remove the gear lever turret section of the box and see if the selector rail is moving gears or the rail itself.
as the 5th gear and reverse gear are on the same shifter rail the there may be a problem with the selector fork for reverse gear. Undo the bolts that hold the shifter turret to the box and see if the reverse selector moves when you use a lever to move the rail
check the drain plug magnet for metal bits. Mostly you can remove the rear extension housing with out removing the gear box and you will find a small gear on the cluster shaft ( bottom shaft) and a larger gear on the out put shaft ( tail shaft) . Check that the shifter fork is actually moving the larger gear or gear dog into 5th gear (Fork loose on selector rail) or check that there are still teeth on the smaller gear as excessive high speed under load will rear out the teeth
I am guessing that the selector fork has not been tightened up on the selector rail and you are moving the rail back and forth but not moving any gears . Otherwise there would be crunching noises going on.. Take it back to the mechanic and tell him to fix it properly.
If it is a top shift transmission you need to pull the boot cover off the shifter by removing the screws and pulling the rubber boot up to the shaft shift knob, next look at the shifter on the transmisson you will see a a upside down U push down and remove the c clip I think this is a C4 but don't remember the difference one is a 5 and the other is 4 but the top comes off the same way push down on the above part twist it counter clock wise and pull the shift lever out. there will be three shift rails look to the one that is on the right side and with a screw driver shift it forward and the backward you will see a notch in each rail if any of them do not have a spring to them that one has a broken detente spring or a broken shift or a shift rail that is in the shape of a U is broken or gone past the reverse lever not allowing to shift all the way into reverse, it could also be that the ball on the end of the stick shift has worn off in that case it will need to be replaced or welded up and ground down and smoothed off with sand paper then polished so it will be shinny, I don't recommend you do this unless you have experience in doing the welding, go to a junk yard and get a used one or buy new, the price will knock you off your feet.