Maybe even just a super basic system of labeling like, one or 2 letters written in Sharpee on the bottom?
But then you're going to get - "was his hand when clean he handled the vial to write on the bottom?"
"What steps of sanitization do you take when writing the letters on the vial?"
"Has the sharpie been placed in an autoclave? "....
No label and colored pop tops is better... Write on it yourself