As with most conspiracy theories these documents prove nothing at all. The only eyewitness to these "bombs" was a guy who saw small drums of what he believed to be mercury fulminate being removed from the destroyed building. Hardly evidence of additional bombs. There were many law enforcement agencies in that building and it would not be out of the realm of possibility for something like that to be stored in there for uses outside the building for training or whatever. The rest of the statements were "media" based or overheard or nothing at all stated about so-called additional bombs. Some guy who said it didn't "smell" like ANFO several hours after the bombing proves nothing. By that time so many chemicals had probably been used and probably some fires had been working that it would cover up any smell.
Appears to be nothing but an emotion based theory to blame somebody other than the murderer who did it for purposes to suit someone or some groups own anti-US government agenda. It takes more than untrained people overhearing conversations and being repeated back to the media to convince me that the ATF or FBI or any government agency had ANYTHING to do, directly or indirectly, with this bombing. The Government documents also appeared to be just regurgitations of media reports or unconfirmed reports. I dont see one document there that actually relates to the official investigation that occurred later on. If there was official findings of additional bombs, confirmed bombs that is, then it might mean something, who knows what though.
You must remember that this was a highly chaotic and devastating experience at the time and anything would be thought of as a bomb by people at the scene. A green drum would be a bomb, a box would be a bomb, a tube with wires would be a bomb, etc. So reports, all unconfirmed, at the scene were more than likely peoples emotions coming out than a true state of affairs.
I cant imagine that a bombing of a building by government agencies or operatives could possibly remain secret for long in our government. And to what purpose would it serve them?