The largest readily listed box I found in Australia is the Ferrero Collection Rocher Raffaello Rondnoir Chocolate Gift Box 48 pack at Woolworths.

What that means

That box includes Ferrero Rocher and Raffaello as part of the assorted collection, not a single-flavour mega box.

Other large options

A common standalone Raffaello box available in Australia is the 300g gift box , and some Australian sellers also list 23-piece Raffaello boxes.

Practical takeaway

If you want the biggest box that clearly includes both Rocher and Raffaello, the 48-pack Ferrero Collection is the best match from the sources I found.