I think my RM30Ms (shipped to the UK) came in a double cardboard box arrangement.
The speakers, with the foot assembly removed, were in a linen type bag, then supported with polystyrene end and side pieces, placed in a cardboard box. This was in turn in a further cardboard box I think.
My speakers arrived OK but I heard that others in the UK had scratches on the veneers, although I'm not sure if that was from the transport or how they left the factory.
It would seem a good idea to photograph them all round to have a record of their condition as they left you.