H type boxes

[hangarman]

Below is a list of H type Ammunition boxes in use from @1914 to @1945. Can anyone tell me what happened to the missing numbers? i.e. H2, H5, H6,H7,H8, etc. i'm sure they must have been used for SAA but became obsolete before 1945 and were thus deleted from the list. Can anyone fill in the gaps, or at least point me in the right direction.
Cheers
Gary

H1 mk I
H1 mk IE
H1 mk 2
H3 mk I
H3 mk 1E
H4 mk I
H4 mk 2
H9 mk I
H9 mk 3
H9 mk 3E
H11 mk I
H13 mk I
H13 mk IE
H13 mk 2
H15 mk I
H19 mk I
H20 mk I
H21 mk I
H21 mk IE
H22 mk I
H22 mk IE
H24 mk I
H24 mk 2
H25 mk I
H25 mk IE
H25 mk 2
H26 mk I
H27 mk I
H27 mk IE
H28 mk I
H28 mk IE
H29 mk I
H29 mk 1E
H29 mk 2
H29 mk 3
H29 Mod mk I
H30 mk I
H30 mk IE
H31 mk I
H31 mk IE
H31 mk 2
H32 mk I
H32 mk IE
H33 mk I
H34 mk 1
H35 mk 1
H37 mk I
H40 mk 1
H42 mk I
H45 mk 1
H47 mk I
H47 mk 2
H49 mk 1
H50 mk 1
H51 mk 1
H52 mk 1

 

[Bonnex]

Three from an Indian publication:

H2 Mk 2 or 2E Cart SA Ball 303-in Mk 7 or 7Z 600 rnds in chargers

H17 Mk1M or 2E Cart SA Ball 303-in Mk 7 or 7Z 1000 rnds in chargers

H18 Mk 1 ditto but 1000 rnds in bundles

If they were Indian Pattern they would be IH2, IH17 and IH18 so I guess they are British pattern boxes.