I understand your concerns. With our machines the QR codes can be forged, but manual recounts are done using the human readable votes on the receipts, which you have to check before leaving the voting booth and dropping the receipt in the ballot box.

Also, we have opkomstplicht (compulsory attendance), although research shows that our votes wouldn't change a lot if voting were voluntary. We also always vote on Sundays.

EDIT: Also, about 1 million people (around 10%) didn't show up to vote, despite the possibility of getting a heavy fine. Not sure how this influenced the result.