The entry for Fourth+ states "Five pre-colored dice in a small poly bag (no D10 or dice crayon)."

What are the five die?

What came with the yellow d4, pink d6, green d8, light blue d12, and white and red 0-9x2 d20?

If the 4th+ Basic Set has a poly bag with inked dice and no crayon, it's the same set found in earlier printings (yellow 4-sider, orange-red 6-sider, green 8-sider, light blue 12-sider, white 20-sided). This set was also sold separately as the Polyhedra Dice.

The white 20-sider and pink 20-sider were also available as a separate set in a poly bag, but not in Basic Sets. This set was found in the Gamma World and also sold separately as the Percentile Dice.

These posts have some advertisements and catalog listings: ZENOPUS ARCHIVES: Veteran of the Dice Wars

ZENOPUS ARCHIVES: TSR Percentile Dice in the 1970s