Eagle eyed Jiff:
You have accurately assessed that the as found photo has PAHBs which are conspicuously absent from the on the docks photos.
Note the long narrow crate strapped and tarped to the trail legs. PAHBs and RHBsWSI (Round, hollow bits with springs inside- known to some as magazines) were all carefully crated, strapped to the trails, tarped and fumigated (Canadian made crates that have been out of the country require expensive (200 sterling!) fumigation to ensure that no unwanted European bibits and bugs sneek into Canada!
The paper file on this adventure now outweighs the whole mounting!
I have become somewhat of an 'expert' (that is: a has been drip under pressure) so I could put together an aide memoire on the process complete with contacts.
Mike