We know that they've been tampered with though. We received information earlier in this situation that they couldn't just record Jason singing a full song, he doesn't sound enough like Michael to fool anyone that way. So they most likely did multiple takes to get a line to sound right, which we've been told by our own researchers (that's what I'll call them from now on). After doing that for all twelve songs, they put them together, made a complete song out of fragments, and added genuine Michael ad-libs and maybe the odd line from when he was actually singing while being recorded there. One could argue they pitched the voice before sending it to Sony, whatever the case may be, the original demos would be the fragments of lines, they'd be Jason singing the songs prior to Michael's ad-libs being added in.
That's not what Sony got, they got the complete songs made out of the fragments of Malachi vocal and a Michael line and his ad-libs. Remember when Teddy said he had to pitch Monster because when he received it from the Cascio's it was a slower song? This shows in the leaked snippet of the supposed "raw demo". And while it is in slower pitch, the instrumentation is similar to that used in the final version. Which may tell you, that before these songs were sold to Sony or given to the producers, they were touched up, edited to an almost near final version that Eddie himself and whoever else involved in the scheme would've been comfortable with. The raw demoes, the fragments of lines, the original recording sessions, have yet to come forward, it's what they claimed was "deleted", as it's the sole thing that would prove this matter once and for all. And I think those things are missing for a reason.