+ different courrier's, entrance points, time of entry, where custom are more active in general /at that time etc...
(Side note) And If they are seized :
Are the vials marked with info or not, just stealth packaging, or a 'stealth experience' this is something different..
= this makes a difference in what happens after, how and what effort customs /police want to throw at me...
But like you, I prob. just got a bit de-sensitized over time, I just like to train and recover aka. really boring! (so who the F cares) , a bit to gazzed up sometimes -> but the only harm I am doing is to myself...
+ I've been caught so many times...