That aged well...
Achtung, ganz dumme Frage:
How should anybody proof, that you ordered? Like if you singed for the parcel okay, but even then.
Imagine I ordered from Cat just for fun and sent it to a friend house or anyone I know the adress of. So only because they see your name and adress in the data they took after busting Liska is no prrof that those people ordered, right?
Tracking ID or parcel going to your house. Every parcel gets scanned and measured in weight, pictures taken and during investigations like this they also look at where it has been dropped off. So if you receive a package from place A dropped off by a person directly affiliated to the PEDs it gives them reason enough to dig deeper.
For court, all they need is you ordering this parcel, accepting the parcel or proof that you paid or communications between you and the vendor i.e. email.
LE also looks into you even if you just had a shipping label, they follow any trace.
And in the letter they are then able to give you exact timestamps as to when, where and what including pictures of the parcel at a sorting station, sometimes even an xray (DHL does this).
Every 2-3 months are huge wave of new letters is send out, german telegram groups and forums are full of it. Just this month i saw about 13 people posting about getting a letter.
