Rare Items from Pos Indonesia

As a stamps collector, one of the thing that I am constantly searching for stamps or philatelic materials that are available in limited quantity.
Of all the philatelic material that are produced by the Pos Indonesia, the uncut sheets are one of the rarest item in the market. In the normal situation, the uncut sheets were not available to the general public because for some unknown reason, Pos Indonesia never sells this item.
However, in the recent year, they start to sell this uncut sheets. I don't have the information when exactly they start to sell this uncut item, but I expect it didn't start until very recently. That is for the "legal" items.

However, when we are talking about the "illegal items", you can get almost all kinds of uncut Indonesian souvenir sheets from the market. They are not cheap, but it is possible to get them. A full uncut souvenir sheet would cost a minimum between U$ 500 to U$ 2,000 per item. There are various level of uncut available in the market. An uncut pair is being the lowest in price and the highest would be the full sheets which consist sometimes up to 10 souvenir sheets.

Another item which I have not seen in the market is the proof, i.e.: the print proof, the minister proof, artist proof and all kind of proofs from the Indonesian stamps. They should exist, but apparently nobody has stolen them for sales. Like the uncut souvenir sheets, the only way a proof is available for the market is if somebody stealing them from the Pos Indonesian Archive. Strangely enough, you have seen some of the other philatelic materials, but not the "proof". Is it possible that they do not exist ? Knowing the work of Indonesian Officials, it is quite possible that these proofs do not exist.