What (a) is the total number of SA Post Office branches that have been auctioned, (b) is the physical address of each auctioned branch, (c) was the market value of the property at the time it was auctioned, (d) was the purchase price of each property at the auction, (e) are the details of the service provider that managed the auction of the properties and (f) is the total amount that the service provider was paid for the auctioning services?