Day said he got some others to take the paper bag in. I imagine he would end up going through the first floor whether he used the stairs or the freight elevator.
Yes.....And we have many photos of Montgomery carrying a huge paper bag from the TSBD at about 2:20 pm. But Detective Day had departed the scene at least ten minutes before Montgomery. Neither Day nor Montgomery have ever said anything about stopping at the shipping table and comparing the paper and tape. As a matter of fact, I believe the bag was still in the imaginary "Sniper's Nest" being guarded by Montgomery and Johnson when Day left the building with the Carcano.
Now you have Day leaving at 2:50, if Montgomery's watch is correct and you're correct about Day leaving ten minutes before Montgomery. Day was offered a ride to City Hall by FBI agent Bardwell Odum and was at the Identification Bureau on the fourth floor just long enough to lock the Carcano in an evidence box, when he left to return to the Depository.
Day: "On the first floor of the Texas School Book Depository, and I noticed from
their wrapping bench there was paper and tape of a similar--the tape was
of the same width as this. I took the bag over and tried it, and I noticed that
the tape was the same width as on the bag."