Shipping Oversize Items into FBA via LTL

Regarding shipping multiple oversize SKUs via LTL into FBA, do we have to put these items into their own box and then put a box label on that box? For instance, if one of my oversize SKUs is 9"x9"x9", do I have to then put these into a larger box? And then put a box label on that box? Or does that only pertain to standard size items?