Cheap refills

We tried this refill cassettes because they are priced lower than for example the 6 packs.
Unfortunately, in this product we had the feeling that they are not originals. It has but smelled a little more out of the bucket and the film / bag was quite "thin". The cartridge and the carton came without branding, but that does not have to necessarily mean something.
Maybe we all just imagined us, but since we buy 6 packs as they are available also in local trade. Which, although (calculated per Stückl) even at Amazon a bit more expensive, but it smells nothing and the bags to see something "valent" from.