The document that you cited specifically says that no hole was found in the limo floor.
Yes, the SS did not see a hole, & the FBI did not see a hole, in November.
But Detroit/Cincinnati saw a hole in December, after removing the carpet etc.
Then in 1964 the FBI did not look for a hole (they merely asked the SS about the hole)(& the SS said there was no hole).
And we can say that the SS either did not look for a hole, or, if the SS did look & find a hole, they kept the hole a secret (& denied its existence).
I could not find a copy of that Dec 63 magazine or article. Did it include a pix of the hole.
The hole is probly still there -- under the new plating -- at the Ford museum -- if anyone cares to look.
U would need to raise the limo -- & look up around the driveshaft -- the hole is on the centerline -- the driveshaft might have a ding too.
I guess that the President's Commission (ie the WC) did not pursue this reported hole.
I am not sure at what date the WC & Co decided that Oswald's first shot missed -- at which time the hole would of course have been welcome -- but producing the hole at that late date would have risked the uncovering of their history of lieing -- no, not worth it.
And, for some reason, Robin Unger refuses to show the pix of the hole, & a pix of the FBI internal memo, in his photo gallery.
Even tho the hole does not contradict his favorit theory that Oswald fired 3 shots including the fatal headshot.
The hole is not nice & round -- hence it confirms the ricochet offa the (western guyrod of the) signal arm.