Here is some of what Hosty wrote in his book “Assignment Oswald,” page 107-110, about how the evidence was transferred to the FBI:
Tuesday, November 26, 1963 TIME: 8:30 A.M. By the time DeBrueys and I arrived back at the police station to resume our work the next day, Henry Wade, the Dallas district attorney, had convinced the police that they should release all the evidence to the FBI. Because the transport of all the evidence was going to take a lot of work, Ken Howe came over to Lieutenant Potts’s office to help us. The police mandated several conditions for the release of all the evidence. They wanted two of their property men to accompany us to our FBI office to assure the chain of custody. They also wanted us to catalog and photograph everything, then provide them copies. That’s mighty big of them, I thought, seeing they’d had the past four days to do that themselves. With practically no help from the police, DeBrueys, Howe, and I boxed up everything and began lugging the boxes downstairs to the police garage and my car. About 90 minutes later, we packed the last box into the backseat. With the trunk and backseat crammed full of evidence, Howe and DeBrueys climbed into the front seat, and I climbed in behind the wheel. The two property officers got into their car, and with them following, I drove out of the garage. I guess word traveled fast that the FBI was taking away the evidence from the assassination, because as my car reached the top of the garage exit ramp we were met by a dozen television cameramen and photographers. With bulbs flashing rapid-fire and television reporters solemnly announcing that the FBI was driving off with the evidence, I maneuvered our way out of there. TIME: 11:00 A.M. After unloading the evidence, we took the boxes up to the seventh floor, where we found a couple of long tables and set up shop. DeBrueys grabbed a Minox camera and propped it up on a kind of tripod so that it was about 12 inches above the table, its lens pointed straight down. While the two property officers looked on, I started feeding, one at a time, each of the items that had been seized. DeBrueys focused and snapped each item as they were fed through. When each item was photographed, we had to catalog and mark it. To say this process was time-consuming would be an understatement. It was particularly tiresome because of the sheer volume of personal papers belonging to Lee and Marina Oswald. With short breaks for lunch and dinner, DeBrueys and I worked long into the night. TIME: 12:45 A.M. DeBrueys and I were just about finished when Vince Drain, one of our liaisons to the Dallas police, came into the room. The two police property officers stirred just a little in their chairs, cocking their heads to listen. “Hey, the police still have some more evidence they forgot to give you,” Drain said. “Captain Fritz has in his desk Oswald’s wallet, one shell casing from the rifle on the sixth floor of the depository, and Oswald’s notebook. Fritz said to run over to his office and he’ll give this stuff to us. Hosty, Malley and Shanklin want you to go over there yourself and get it.” “Sure. I’ll head over there right now,” I said. DeBrueys continued to work, feeding the items in one at a time, photographing them, cataloging them. I put on my suit jacket and left. I had heard that Fritz was single and that he had an apartment just across the street from the police station. When I got down to the station about 1:00 A.M., Fritz was already there. He greeted me cordially, not the least upset that he had been roused from bed to hand over evidence. He walked me up to his office. It was quite a contrast to see his office and hallway at this hour: it was so empty and quiet compared to Friday afternoon’s chaotic scene. He unlocked his door, hit the light switch, and went over to his desk. He opened one of the drawers and pulled out the address book, wallet, and shell. I got out a piece of paper and wrote up a receipt of evidence: Received from Capt. Will Fritz at approximately 1:00 A.M. on 11/27/63: Billfold and 16 cards and pictures taken from Lee Harvey Oswald on 11/22/63. One notebook recovered from room of Lee Harvey Oswald at 1026 No. Beckley on 11/22/63 with names and addresses. One 6.5-mm rifle hull recovered at Texas School Book Depository, 411 Elm Street, Dallas, Texas, on 11/22/63. James P. Hosty, Jr., Special Agent, FBI I signed the receipt and gave it to Fritz. Then I picked up the evidence and thanked the captain.
I underlined the part about how many cards and photographs were taken from LHO on 11/22/63. For me, this appears to be further evidence that the (less than 16) cards included with the wallet in the photograph (posted elsewhere recently) taken in 2013 of the assassination evidence exhibit do not represent a complete inventory of the items.
Also, it appears to me that the letter from LHO to the FPCC that Hosty writes that DeBrueys found should have been photographed and catalogued during the transfer process.