You're not with those hologram crowd - you're with the thermite, one guy found 3 black boxes crowd.
Science says they couldnt have vaporized into thin air. Its scientifically impossible with the "official" elements that were used on 9/11.
So the options here are
1. The mechanics at Walmart forgot to install the blackboxes
There's nothing quite as funny as 9/11 humor, right? lol!

2. They werent commercial airliners, but rather fortified military airliners sent for an operation
"They" didn't fortify the Pentagon and Shanksville planes, though? Or "they" did, but just forgot to remove those black boxes? And what to make of the two commercial airliners which boarded passengers, left the gate, then took off from Boston and tracked all the way to Manhattan?
Ive always leaned that they were regular jet airliners.....it doesnt mean you couldnt have fortified, or re-routed them, perhaps over PA and blown them up and use fortified military planes but this is just my theory. More than likely they were traditional jumbo jets, but the hijackers did seem to be protected by the government.
3. The blackboxes were found (we have a documented witness who came out) and the government confiscated them.
Why would military fortified aircraft have black boxes which "they" didn't want found?
I remember hearing about the guy who claimed to have found the black boxes. He actually claimed to find 3 (!) out of the 4. Right...
I remember him finding him at least 1 when I used to research this. Some quick googling I ran into they found 3 but I remember seeing in interview but that was a long time ago.
As for military fortified aircraft having blackboxes which werent found....I think my previous leanings answer that questions.
4. Some technology or other materials used at the WTC site that actually did vaporize them, well actually had them molten as evidenced with flowing channels of molten steel as the NYFD described as lava....Jet fuel would not create these conditions.
Are you trying to say "thermite" or "nanothermite"? Thermite doesn't burn long enough to be molten days after ignition. Humans have been melting metal for millennia without the aid of thermite. The energy of the collapse along with all the combustibles and oxygen is all that was needed to create that condition. No thermite necessary.
I meant non-thermite which for certain can molt metal, I remember seeing Architechs and Engineers running demonstrations on how east it is. Construction crew can paint beams with ease, and the Bush family (Marvin Bush) took over security of the WTC site that year but this is just theory that would come with any investigation and Im moving away from the main topic slightly. We have suspects.
The WTC buildings had both explosions all over the place, both by multiple witnesses including first responsers, city agents, and more and you can see it visually as well from multiple angles. Whats more alarming though is Building 7 more than anything which wasnt hit by a plane and the governments account that it fell completely at free fall speed due to fire is completely impossible. Building 7 is our smoking gun.
Just my opinions, some of many to think about.
On another note, back in the 70s there was a video of the builders of WTC and they did design it to take the impact of planes....of course, people dont always get it right but that was in mind since the Empire State Building had been hit by a accidental small plane crash.
The alarming thing is that the controlled demolition of the Seattle Kingdome had less of a seismic impact that the WTC buildings had, those buildings were pulverized and its collapse amoung the countless anomolies always leads many scientists, architects and engineers as to how they were destroyed.....but Ill repeat, Building 7 is our #1 smoking gun.