You'll just have to take the plunge and risk it, try for yourself. Don't be stupid, this will be costly and tedious and slow moving. Test anything that is received and be prepared for a loss.
Could be an error in synth or something like that. Not bad to have 5-APB at least, not that easy to get either but still the worst of vendor business practices to not deliver as advertised.
Quite the little vendor. Kinda reminds me of Paracelsus. Buying modest weight of few products from international suppliers and reselling for an upcharge domestic US I'm guessing.
Well there are precious few ways your rate could have improved considering a sample pool of two. Two received, or two lost, only alternatives. If you had a long history of packages that would have been data to go on. I've been lucky enough in the past to never have a package with them lost...
Likely CF as there were updates on the vendors thread over there recently. If you don't know what forum that is sorry, can't help you. You'd have to establish activity over there to even get access to the markets anyways.
Dancesafe is pretty classic.
https://dancesafe.org/product/complete-set-of-all-8-testing-kits/
I got mine recently from WIM Scientific Laboratories.
https://wimscilabs.com/product/6-reagents-bundle/
Though in the past I used to order NIK test kits until they disappeared from Amazon and...
Yes but this would be pricing a product UNDER what the manufacturers do. Especially since they claim the lab is in China, where 5-MAPB is illegal.
As I said, would be tremendously glad for them to be legit.