Amazon MWS - Shipping TAB - Field - number_of_boxes

Question

I try to find out which field I have to use to fill the 'number_of_boxes' field for the amazon mws product upload.

My product.xml looks like this:

<Product>
  <SKU>3.08.rot</SKU>
  <StandardProductID>
    <Type>EAN</Type>
    <Value>000000000</Value>
  </StandardProductID>
  <ProductTaxCode>A_GEN_STANDARD</ProductTaxCode>
  <LaunchDate>2021-12-14T10:40:38</LaunchDate>
  <Condition>
    <ConditionType>New</ConditionType>
  </Condition>
  <ItemPackageQuantity>1</ItemPackageQuantity>
  <NumberOfItems>1</NumberOfItems>
  <DescriptionData>
    <Title>Test Title</Title>
    <Brand>Test</Brand>
    <Description>Test Description</Description>
    <BulletPoint>Bulletpoint 1</BulletPoint>
    <ItemDimensions>
      <Length unitOfMeasure="MM">50</Length>
      <Width unitOfMeasure="MM">51</Width>
      <Height unitOfMeasure="MM">303</Height>
      <Weight unitOfMeasure="KG">100</Weight>
    </ItemDimensions>
    <MSRPWithTax currency="EUR">699.00</MSRPWithTax>
    <Manufacturer>Test</Manufacturer>
    <MfrPartNumber>rot.test</MfrPartNumber>
    <SearchTerms>SearchTerms Test 1</SearchTerms>
    <RecommendedBrowseNode>343511011</RecommendedBrowseNode>
    <MerchantShippingGroupName>Prime vorlage</MerchantShippingGroupName>
    <SupplierDeclaredDGHZRegulation>not_applicable</SupplierDeclaredDGHZRegulation>
    <AssemblyInstructions>Test</AssemblyInstructions>
  </DescriptionData>
  <ProductData>
    <Home>
      <ProductType>
        <Chair>
          <Material>Leather</Material>
          <SeatingCapacity>1</SeatingCapacity>
          <ItemTypeName>Testproductl</ItemTypeName>
          <FrameMaterialType>Stahl</FrameMaterialType>
          <TopMaterialType>Metal Leather</TopMaterialType>
        </Chair>
      </ProductType>
      <Parentage>child</Parentage>
      <VariationData>
        <VariationTheme>Color-Material</VariationTheme>
        <Size>B60 x T46 x H115–123 cm</Size>
        <Color>Rot</Color>
      </VariationData>
      <CountryOfOrigin>DE</CountryOfOrigin>
      <IncludedComponents>Extras</IncludedComponents>
      <SeatHeight unitOfMeasure="MM">46</SeatHeight>
      <SpecialFeatures>keine</SpecialFeatures>
      <StyleName>Modern</StyleName>
    </Home>
  </ProductData>
</Product>

On the picture the missing field is marked. I use the category "chair" but there is no field for number_of_boxes. Which field I have to send for "number_of_boxes"?