One thing the computer forensics look for is the real date/time/location they were uploaded - not the date-time it shows in the menu. If they all came from one or two sites or all at once, it’s a pretty sure bet it might have been “pushed” there.
While this is true how many people will have the time/money for doing a computer forensics analysis as their defense? (I mean it's fairly expensive.)
How much do you want to bet that the FBI [et al] can set up timers to vary the download times? Or to plant-and-alter when they do their own investigation
?
What we are seeing here is a complete lack of moral character; to expect them to play by the rules is [IMO] stupid — unless they're the ones making the rules.