Hi rob_226575, thanks for your post.
In certain cases, if your preferred carrier can't accept your item, we'll provide you with a label for a carrier you've opted out of in your settings. For example, if your parcel exceeds your preferred carrier's size or weight limits, we may send your item with an alternative carrier. For more information about carrier options and postage rates, see our Simple Delivery Seller Centre page.
Thank you,
Marco
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