Since Parcel2Go has multiple carriers you can select, I guess that suggests that the insurance is being provided by P2G rather than the carrier?
I’ve had this recently with camera equipment – they only insure against loss not damage – but since it’s very easy to pack camera equipment up such that the chances of it being damaged are negligible I’ve never really bothered. It’s useful to know that the same applies for frames now as well.
If you get a proper frame box and brace the rear and front drop outs and then pack it well it might be reasonable to assume that the risk of a frame being damaged is also negligible.