"No More Silence" was published almost 40 years after the assassination. That's a long time. You should be wary of putting too much faith in the reliability of such ancient recollections.
It seems just a few months were sufficient to dull memories of trained police doesn't it? Unfortunately we have an unsatisfactory evidence base to work with. Pity the WC staffers were unable to help with clarification. I understand your reluctance to look for a logical answers to the questions posed. I believe you appreciate my desire for them to be answered.
At least you stepped up to represent a normally vocal group. It seems the WC narrative has Oswald transporting a disassembled rifle in a paper bag with only one end sealed. He folded the bag an unknown number of times and left it next to a box he sat on to shoot the President. The crime lab discovered remnants of a chicken lunch and assumed it to be Oswald'sfor some time after the event. After assisting Day with the rifle discovery Studebaker returned to the SN. Day left the building with the rifle. Studebaker dusted the bottle on the sixth floor and not the lunch sack. He moved to the SN and about this time Johnson claimed the bag was unfolded. Eventually dusted for prints by Studebaker it was removed by Johnson and Montgomery before Day returned to the TSBD.