That is my major concern too but the seller said they were removed because he upgraded to 1 tons. Attached is the pic from the sellers ad. They definitely do look a little rough compared to the axles on my jeep.
View attachment 118328
Here are my 2 concerns 1st they are laying on the ground outside, the rotors are rusty so they have been there for a while. When the axles lay out like that for some time inside the center section any part of the metal that doesn't have gear oil on them will start to get surface rust. That would mean gears, pinion, and bearings that were out of the oil.
2nd thing is if he already has the best stock axles and upgrading to 1 tons or something else then that tells me that he might have been a hardcore crawler. That is what is hard on the internals and tubes.