If the government had only been more forth coming and avoided the appearance of deception. If only the 911 Commission would have interviewed people to get the truth.
Take this black box article that names names by Greg Szymanski at:

[link to www.arcticbeacon.citymaker.com]
Snippets:

FBI Tells 911 Rescue Worker to ´Shut Up´ Over Finding Airplane "Black Boxes."
Two ground zero workers go public about finding cockpit and flight data recorders from Flight 11 and 175. Government claims ´black boxes´ from the doomed 911 flights were never found. 911 Commission ignores information and fails to interview rescue workers.

A 911 rescue worker said this week he was told by FBI agents to "keep his
mouth shut" about one of the "black boxes" found at ground zero, contradicting
the official story that none of the flight and cockpit data recorders were ever
recovered in the WTC wreckage.

Honorary firefighter Mike Bellone claims he was approached by unknown bureau
agents a short time after he and his partner Nicholas DeMasi, a retired New
York firefighter, found three of the four "black boxes" among the WTC rubble
before January 2002.