Pete,
I may want to take my bet back. The installation instructions note "that the matched kinescope is is shipped in a separate carton but as a part of the same receiver". The carton shipped in the bottom part of the receiver contained the yoke, purity coil, and kinescope mounting components. Since the chassis first had to be removed to mount the 15GP22 and associated components, I can see the chassis being delivered, out of the cabinet, for two possible reasons: the technician can give the chassis a "once over" before installing it, and it would lighter on the guy's back. Looking at the tag, the person who filled it out seemed to be very deliberate in their handwriting, so I'm sure if there had been a repair date, it would have been included.
Phil
BTW, at the shops where I worked, we ALWAYS replaced all the screws.