Yeah upon rereading the story there’s no shot, tampering with 50+ bottles of eliquid without breaking the break-off band or messing up the plug. Anon is basically a fly by night compounder

But yeah, 35/50mg are the default strengths for majority USA salt nic eliquids off the shelf, the standard set by Juul upon first entering the market (though arbitrarily Juul measures by weight rather than by volume, so their pods are actually 59mg/mL)