Unfortunately even the US is catching up to this trend where things are portioned out in standard packs (rather than loose).
You can see how different countries have different customs for storing their goods here [1], this was linked few days ago in a diff thread, but is illustrative.
[1]https://menzelphoto.photoshelter.com/gallery/Hungry-Planet-F...
https://www.theguardian.com/world/2018/apr/05/fraudster-made...
and
https://www.toytowngermany.com/forum/topic/52114-lithuanian-...
Apparently you could produce fake bottles for a few cents and get a 5-15x return.
However, at the time at least the problem apparently wasn't so much people manipulating return machines but rather bottles miraculously appearing out of nowhere from within the system (i.e. parties trying to register a bunch of bottles more than once or attempting to remove bottles in-between checkpoints in order to "reuse" them later on).
Also your number is also very specific: Are there non PET single use bottles as well? What counts as recycling anyway. Shipping to China? Burning?