if you're frequently buying in quantity, think it is more likely that sleight of hand by your dealer is leading you to believe they're real. fake adderall are insanely cheap/readily available containing a low dose of meth. FDA QC is pretty elaborate and includes taking a sample at the start of each "batch"/run within a certain limited amount of time. It would have been noticed, any others produced destroyed. That said, orientation of the "30" could be considered a permissible deviation. I've never regularly taken it, but im sure some members here have scripts and can confirm if they've ever been upside down
Reagent tests are always good to keep on hand, period. They can differentiate between meth and amphetamine. Again fake addys are a huge business/market and if you've got a miracle source who can get them whenever, or in bulk etc., i'd assume them to be fake.