Please remember that material certs and test reports are not avaiable for all items. Whenever you order material, regardless of who the supplier is, it is always good to request a material cert up front. Here at Component Supply, we do not always record our lot number when we pick an item for an order. This is something we try and do, but sometimes we wind up with “mixed” lot material from jobs. When we fill small quantity orders we may choose this material if the customer has not specified they require a material cert. So if that customer needs a cert after the fact, we would not be able to issue one. This is one scenario, but as a rule, you are always better to request the certs and other documentiation up front.