We already know that Team Pantsuit used the Bleachbit software in an effort to wipe her server ("You mean, like, with a cloth?"). And since we know that the software was used, we can also infer that they weren't smart enough to run it from a portable device such as a USB stick or a DVD - nope, they downloaded it onto the very server they were planning to wipe. That leaves tracks, and you don't have to be an IT genius to follow them in order to determine what was done.
Then there's the fact they sorta forgot that email send/receive data would also be stored in the associate accounts - like Huma's systems, for example. That means they can be recovered even after Pantsuit's private server was wiped. And about 15,000 more were recovered, likely after scanning through associate systems. And they're set for release in September.
No wonder she's taking some time off from campaigning; she has many more lies to come up with.