Oh I agree, but worrying about that in my opinion is stressing over things beyond my control as I can't verify that data is accurate before or after taking rece

Oh I agree, but worrying about that in my opinion is stressing over things beyond my control as I can't verify that data is accurate before or after taking receipt of it, and it's kind of a moot point when buying a second hand consumable device as it's pretty much guaranteed to be used/worn. Also, devices can change hands multiple times before it ends up on the second hand market, with anyone in that chain potentially being responsible for fudging the numbers. It's why I start from the zero-trust assumption that the data is unreliable, always buy in quantity and always assume a non-zero failure rate of some kind (thus the reputable vendor with a return/refund policy). The failure rate is rarely actually that high in my experience, but it does happen from time to time and it sucks if you're trying to deploy for example a 4 device array, and you buy 4 devices but 1 doesn't work and as a result now the whole array can't be deployed.