I have to admit that I'm not big on boxes these days - I just don't listen to them much, which is completely my fault - but I'll second the recs of Bird on Savoy and Dial, and Billie on Columbia.
A few other favorites: Louis - Hot 5's and 7's (either Columbia or JSP); Bud - Complete Verve; Django - the JSP sets mastered by Ted Kendall.
If I'm allowed to stretch it to non-jazz sets: the Muddy, Wolf, and Walter sets on Chess/Hip-O Select; Elmore James - Flair/Virgin/Ace (Flair/Modern/Meteor/etc. sides) and Capricorn (Bobby Robinson sides); Budapest String Quartet - Beethoven String Quartets - United Archives.