I would suggest that you re-read the WHOLE of 19B.
Unless you are not absolved of the requirements as stated in 19B(2), then 19B(1) applies, i.e. (a) -'Concealed from view'. There is not a specific requirement to lock it in a big-arsed case (unless you want to).
There are a lot of ands and ifs. Read it all. Then read it again, slowly. Get your head around what is actually required by the Regulation.
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