Welcome to the site, Hobby, And 'adventures' to come. Tap talk pictures are terrible. It Looks an OK truck, It will look good with TLC and paint. However, If nothing else is wrong with the truck, (and the jib retracts,) Providing it is road legal (and for you to drive with the correct documentation etc), And you only live a mile or so from where it is at, simply drive it home in low range. Keep to 2000 RPM. (you can keep below if it sounds revy, just drive comfortable). Do the 'fix' later. This of course begs the question as to what price you won it for with 'faults found'.
If it has been backed up from the incorrect gear, it might have 'wind up', so firm (not ridiculous)pressure on the shifter while moving forward in 1st gear (ONLY!) And "rocking" the clutch Might pop the sticking transfer. If it moves freely in the range it is in now it might well need attention to the transfer. Good luck. Post results of the problem and fix with pictures.