Switzerland Canton Issues

I received these as part of a collection, and am wondering if they are genuine. Thank you in advance for sharing your expertise.

All fakes

You will notice that all the background squiggly lines in the top 3 stamps are identical.Same forgery series.(looks that way from your poor pic).
Some more info in this thread:
https://goscf.com/t/65970

I don't know if this is a standard "tell" in detecting Swiss forgeries, but I've noticed a lot of the fake stamps don't have recognizable (real) postmarks. Instead, they have bars or lines or some other very basic marking. I'd guess that's because it's easier for the faker to reuse the same bar cancel over and over on many stamps which you would not be able to do with a real-looking cancel with a town name, date, and so on. If that's not a legitimate or common characteristic of fake Swiss stamps, let me know.

I like the tip that the backgrounds on these three stamps all look like the same background. Is that because the forger just reused them over and over? Notice the little dark triangle mark in the upper right corner of all three stamps. Could you be any lazier than this? Is he printing all these stamps from the same "background plate" (in different ink colors, and on different colors of paper, of course) and then adding the red shield and denominations to those identical backgrounds? Not sure how this is done.