The trash is unpaid?

[jammerdan]

@Alexey

that this deleted data could be on the disk up to two weeks with unlucky timing

Not just timing.
We have seen many things that can lead to the case where deleted data does not get deleted: As we have just learned recently that Bloom filters can be too small, not being sent out on time or at all, deleted due to node restart etc. garbage not moved to trash as filewalkers did not finish. So there are many options that can easily increase the time beyond 2 weeks and more.
And even if everything goes normal, as it was mentioned before about the way Bloom filters work, they don’t collect everything thus leaving a certain percentage of data untouched that should be moved to the trash:

How does garbage collection works

Yes, garbage collection will clean up any pieces that shouldn’t be there. It works using bloom filters. That’s a sort of compressed piece of data that with clever code will check pieces if they match. All pieces you should have will match the bloom filter. All the pieces that don’t match will get cleaned up. Though about 10% of pieces your node shouldn’t have will also match that bloom filter. So it will take more than one run to clean up everything.