You are not getting the point. If Frazier is telling the truth, then Oswald is lying. You can't have it both ways. The idea that someone would confuse a normal lunch sack for a bag over two feet long - particularly after Frazier indicates that he specifically asked Oswald about his lunch because he was not carrying his lunch bag, and Oswald confirmed to him that he didn't have it is comedy gold. But if this is your claim, then it is necessary explain to us why Oswald would carry a bag about two feet long or his lunch, tell Frazier it contained curtain rods, and that he didn't have his lunch that day but then tell the police that he didn't carry curtain rods, his lunch or a bag this size the length described by Frazier. It's laughable to accept your claim.
If Oswald were innocent, no one would have had to look for this bag. He would have instructed the police to find it and insisted that they did so because it would have assisted his case. He only denies the existence of a long bag because he knows it will incriminate him. Even a child could understand that. And how do we know they searched the building? Because one of the things they found was - wait for it - a long bag! Whose prints were on this very bag? Wait for it - Oswald's! Then you go down the path of the implying that someone planted this bag while going on and on about not claiming a VAST conspiracy. HA HA HA. That is rich irony. The bag is pictured being carried out of the building. Several police officers saw it. Case closed.
Yes, but like most conspiracists he doesn't trust or believe the police and government. So whatever evidence they produce - directly or indirectly - of Oswald's guilt is in his view part of the framing of Oswald. It doesn't matter how much evidence - the backyard photos, Marina's testimony, Frazier's testimony, the physical evidence, the circumstantial, even Oswald's statements (at least when they implicate him) - it's all corrupt. Because "the CIA" and Guatemala and Operation Northwoods and military industrial complex and JFK was a threat to that.
It's a bit amazing that they demand all of the evidence, all of the files be released. They say they want all of the information. Then they turn around and try to eliminate the evidence against Oswald by saying "chain of custody" and hearsay. They want all of the evidence on one hand and want to make it disappear on the other.
One more: Oswald was dead. They can say he admitted to the backyard photos, to carrying a large package, to going to Mexico City, to hating JFK. But they didn't. Why not? In conspiracy world everything was controlled, micromanaged, directed but they didn't do obvious things like this?