As others have noted, there are 7 Hep CDs covering Wilson's recordings for Brunswick and Columbia. They're all available, I think, and more cheaply than Mosaic would charge for a box - my set cost about fifty quid.
To me, leaving out the Holiday material would have made the CDs less interesting - rather like the Basie/Prez box left out loads of not very good Basie material. To get the full flavour of these old bands, one really needs to have all the poor stuff as well as all the good stuff. This is not a collector/completist issue; it's an understanding issue. The twenties and thirties are so far from our own experiences that the era is almost as foreign to us (certainly to an Englishman) as is present day Senegal.
MG
I may be wrong - I have only four of the seven Teddy Wilson Heps - but I believe that the Hep issues include very few of the solo sides. The French Columbia LP box included it all, including unissued alternates, which are often very enlightening. I believe that the Heps run from 1935-1940. The solo sides begin in 1934 and end in 1941.