To check or not to check ...

[vim]

Choose a bin thats good for you and not expensive. Buy 5 and check them offline on parking or whatever. Then try shopping with the live ones.
If most of them are alive then use without checker when buying.
If most dead then buy some checked ones, try 1 at real shop , etc
You can figure by process of elimination if a bin needs to be checked first of all and if it may be getting killed by checker
Hope that helps