PWB packaging for shipment and storage

Our company (assembler and user) has experienced some board problems relating to warpage and solderability. The manner in which they are packaged by our fabricators and stored in our stock prior to assembly has been questioned (as one of many factors which we are evaluating). Has anyone any suggestions to offer regarding such questions as: desiccant vs none sealed vs unsealed bags racked vertically (like vinyl records) vs lying flat in storage

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