If you managed to go as long as you have without encountering a broken-off pin on a miniature tube then you are one very lucky sort!
And your being so astounded by such betrayal by UPS.... ?....!....
Hey, I can appreciate your frustration, but all the stuff you are observing as wrong with your newly-acquired set can be corrected. I've encountered the problems you are having with your volume controls many a time. This is all fixable; you need to simply analyse the assembly calmly, and you will find out what tabs have unfolded due to stress, and will probably be able to figure out how to reassemble that control assembly so that all will be within tolerance, and work properly; I've made such repairs many a time--trust me. Bear in mind that it was assembled to begin with, so this is not impossible work. I did it many times over my career--repair of concentric controls and other types that had been "kicked in" by the hapless owners. (Mostly it was car radios in the earlier days. If I took a facetious angle, and asked the male owner how he managed to step on his own radio knobs and ruin these assemblies when they are supposedly safe on the dashboard where no feet should go he'd usually give me either a sheepish, or perhaps a "are you from Earth?" look!)
Look, man! This is all fixable. Just shelve the unit for a spell, take a couple of deep breaths, and then look at it later with a renewed attitude.
Gosh dang me if I didn't have to do this very same thing when confronted with such frustration as you are having right now.
Just remember: You can probably fix this--it's likely not that big a problem. If an old doofus like me has done this same repair hundreds of times on radio gear I'm sure a bright sort such as yourself can probably figure it out...
I'm not saying that the control assembly is not necessarily FUBAR, but I strongly doubt it.