the placement of humidity card and desiccant should be based on the humidity level of the device, that is, MSL index. First of all, humidity cards and desiccants must be placed in the packaging of components. The storage conditions before packaging of dimensional components are very important. The components packaged by the original factory have strict storage conditions, so the humidity indication changes little after you unpack.
in addition to humidity, attention should also be paid to the problems of anti-static breakdown circuit and discharge oxidation. Generally, anti-static packaging bags and vacuum sealed packaging are required.
tepugao is the largest manufacturer of packaging materials in China. You can consult them about this problem