Ok, looking at the gaps in Cat A as defined above by Assif.
I have taken all Cultural and Mixed inscriptions from 2005-12 inclusive (8 yrs). This, on the basis that the report on "Filling the Gaps" dated 2003 couldn't have had any impact before the 2005 WHC.
In this period there were 139 Cultural and Mixed (of which mixed was only 4) inscriptions. Out of interest there were an additional 37 Natural ones
The 139 were split across geographical (but not UNESCO "political") regions as follows (obviously there can be "arguments" about this allocation!)
15 Latin Am + Carib
17 Middle East + N Africa. (Inc Turkey and Israel but not Iran. N African littoral states to Morocco)
19 Rem of Africa
36 Rem of Asia.
6 Oceania (Inc Oz/PNG)
2 N America (US inc Hawaiii and Canada)
10 of the above were situated in a SIDS state.
None of the Cultural/mixed inscriptions were for a territory of a State which was located outside its geographic area other than Hawaii. Similarly there was no issue with multi -state sites
Of the 139 inscriptions, I reckon that 40 can reasonably be assigned to at least 1 of the 12 categories -quite a high percentage!! But it could be of course that the authors of the report were aware of what was coming along.
Herewith the allocation of the 40 by Category (again there might be some argument at the edges!)
1) Pastoralist cultures - 2 (Grand Pre, Richtersved)
2) Traditional production of crops such as wheat, barley, maize, millet, cocoa, cotton, rubber, or fruits - 1 (Columbian coffee)
3) Historic and traditional irrigation systems - 3 (Shushtar, Aflaj, Bali Subak)
4) human seasonal migration (transhumance) - 1 (Causses)
5) Sacred and/or symbolic significance of certain natural features such as mountains, volcanoes, forests, groves, etc - 5 (Osun-Osogbo, Le Morne, Mijikenda forests, Mt Wutai, Suleman-too,
6) African, Asian and Pacific vernacular architecture- 1 (Hahoe/Yangdong, Kaipeng, Tulou, some of the CLs could have been assigned here too)
7) Non European technological properties - 5 (Sta Laura saltpeter, Tequila, Yin Xu, Jantar Mantars, Sewell)
8) Pre-industrial revolution technological properties (mining sites excluded) - 1 (Plantin Moretus)
9) Sites representing Islam, Buddhism, Hinduism, and Judaism - 6 (Preah Vihear, Deng Feng, Ardabil, Hiraizumi, Bali Subak, Masjid e-Jami. The non christina Bahai perhpas could have been included)
10) Modern heritage - 7 (Le Havre, UNAM, Sydney opera, Berlin modernism, Stoclet, Bikini, Fagus, Centennial Hall)
11) Cultural landscapes in Arab countries - 2 (Al Ain, Wadi Rum)
12) African archaeology, rock art, cultural routes and burial sites - 8 (Chongoni, Kondoa, Senegambian circles, Twyfelfontein, Loropeni (could have been under Non Eur Technol) , Meroe, Saloum, Lope-Okanda