Nothing I see would scare me away.
I'd want to know how the power steering leak was fixed. It looks like the rack seals were gone. A little kerosene on a rag will remove ATF (power steering fluid), but it won't remove grease, at least not as well as degreaser (lye). Try spraying the areas with degreaser and see what falls off. If it looks clean after that, it's oil. If it still looks "greasy", it's ATF. It's hard to tell exactly what is leaking after it gets enough dirt mixed in with the leaking fluid.
However, if it was the rack seals that were leaking, and the owner put stop leak (like AT205) in it to fix it, it's not fixed. The seals have to be replaced. Not a big deal to do yourself, but spendy at the dealership, because I don't know of one that'll do it; they want to replace the rack - it's quicker for them and more money in their pocket.
The rear differential mess could be a leaking rear pinion seal, or it could be someone overgreased the sliding yoke in the propeller shaft. Neither woudl concern me enough not to buy the truck.
You may need new CV axle boots at some point, but I would never replace OEM CV axles that weren't clicking or weren't run dry after the boots failed, no matter how many miles they have on them. If they're not OEM, they should be replaced no matter how many miles are on them. Unfortunately, that's something you can't know without removing the boots.
The front of the transfer case is wet; it could be the case, or it could be something else - like an overgreased sliding yoke. I agree that needs another look.