The unidentified
A final line, item without barcode, identity not established, times five, stands in for the five victims no record has ever named, priced at the same rate as the beef line. In the physical installation, this is the one object on the table that can't be taken home: it isn't for sale, because it was never identified. Its barcode exists but doesn't scan. The machine goes quiet, the only moment in the piece that speaks through the absence of sound.
The untranslated line
Where a receipt would normally print a thank-you, this one prints, in Russian and without translation, the director's actual words about liver pies, the line that lit the strike. Most visitors in Amsterdam won't be able to read it. That's deliberate: for a moment the visitor is on the receiving end of an instruction they don't understand and have to go find out for themselves. It's also the only point in the piece where the voice of authority speaks, in its own language.
The one glitch in the format
Among the totals, a real till would never print "exact number never established," because a till is built to always know exactly what it sold. Here it does, in the one place where the historical record itself breaks down: the death toll was never agreed on, and the receipt says so instead of averaging it away.