We are a distributor, not a manufacturer and we mostly sell cut to size sheets, so some of the pieces may be 8" x 10"; others may be 12" x 20"...it just depends...many sizes. We don't have to worry about lot traceability because if a customer requires it, we use full sheets to cut. My concern is not having any identification at all. Should we start labeling each one? Or can we label different sections by different types, i.e. Acrylic Cut off, Polycarbonate Cut off, Nylon, Acetyl, etc.?