The RSD day releases are usually distributed and pre-ordered through the company of the artist. In the shop I work, we have been asked to pre-order the 12'', once, in early March. Since Mercury is under Universal, and Universal has a 70% of music sales in many territories of the world, the available stock is distributed in a first come first served basis, but from previous experience, I know that they also try to somehow send everywhere, even if this means less copies than the ones ordered. The important thing is this: there was a disclaimer, as with all RSD: that we can only order once, available quantities can not be guaranteed. This creates the feeling of being limited, but may I remind you that in the previous RSD, the releases by DS, (the double Charlie Gillett 7', Love over gold half speed, Encores colour, etc) were available more than a year after, at reduced prices and at big online shops like Amazon. I think that they got this lesson and I believe that even the new box set will eventually show up later on, maybe at a reduced price, once they get the desperate ones, like us, to pre order at full price...
Because we do not dare think that we will miss out... FOMO at full play!
If the local Universal partner has more copies available in stock, I will try to order after the RSD and let you know, in case someone is still interested.