Morshead's mob might had had a well deserved reputation as scroungers, but to pinch two brand-new telescoped rifles seems a bit over the top.

Do the dates event remotely line up for this to be true?

The seige of Tobruk was lifted in November 1941; would the No4 T have been on issue in Libya that early?

The 9th Division was still in theatre for El Alamein the next year, would seem to be a slightly more plausible time to liberate the rifles.