I'm really sorry that happened to your RWS 54.
I know the following comments doesn't help you but may help the next person shipping a rifle.
I read somewhere that when "regular people" ship a rifle, one should separate the action from the stock and pack both securely with foam or other appropriate cushioning product(s) and double box before shipping. I don't know if separating the action from the stock and the resulting length reduction (for some rifle) is a factor in breakage reduction. Logic would tend to favor a shorter length box and a wider box/ wider weight distribution surviving abuse versus a long narrow box.
What's curious is that none of the distributors (that I've bought from) does this when shipping a new rifle. All rifles were shipped with stock attached. They must be very good at designing shipping boxes and content packaging that can absorb the punishing world of package delivery. ...except in this case.