The problem is that when you put out a release like this, it pretty much cancels the possibility of a release sourced from the actual masters if they do turn up. As far as the record company is concerned, these titles are now 'done' and even if the quad masters turned up in two years I highly doubt they'd re-do it for release again.
When masters are 'lost', unless they've been burned up in a vault fire they're not actually lost, the record company just doesn't have the time/money/patience to source them. These labels have warehouses of tens of thousands (if not hundreds of thousands) of various kinds of tapes, often poorly labelled, mislabelled, or with barcode stickers falling off so spending money to pay someone to look through everything for a release that will likely sell in the thousands of copies just isn't worth it for them. I can almost guarantee you that the Wakeman masters are sitting in a vault in the US somewhere and left hand (Universal US) doesn't know what right hand (Universal US) is doing.