The above, as a collector of stuff I like to put things together how they where bought new in the day. When buying, a selling factor is how close to as new I can buy. Does the unit/units have all the packaging and paper work? is it consecutive serial numbers, are all the original parts there?
These guys are taking everything apart and selling things individually. For example, they have listings for random groups of manuals, lot's selling boxes alone, selling mono blocks individually, and the tube screens are listed in another lot.
All this stuff is from the units they are selling, but nothing guarantees you can win what should have been with your unit. Let alone the fact in the end you'll probably have to spend over price to try and get the complete package.
They would have been far better off with some stuff putting matched packages together. The better units would have manuals