Are Belgian elections unverifiable?

I recently participated in the local-level Belgian elections as a commission member.

Brussels uses an electronic voting system where all votes are done one a computer and recorded on a floppy disk.

The thing is, given that the "software already counted votes", none counts paper ballots or announces results in-place. Instead, the floppy disks are taken to the city hall where the total result is (apparently) calculated and announced.

Now the question: How do you do a parallel recount with this system? You can't just send the observers to the voting posts to hear the results and communicate them in parallel as none knows the results before they get to the officials in the city hall.