1986 catalog
This box appears to be some kind of Sapporo Ichiban ramen promotion.
According to this page this set was given away by Lion Toothpaste via lottery. This was the A prize, B can be seen here.
Fantasy World Pocket Zaurus (ファンタジーワールド ポケットザウルス)
Contains information about the toys.
Store display box
Story display box
Price label
Schedule board
Pencil board (下敷き)
Metal box
Pencil box
Pins/badges
Vinyl bag
Blow-up vinyl
Telephone card
Telephone card given away in a campaign.
Pocketzaurus’ Big Adventure (ポケットザウルスの大冒険)
Ice pops released in 1987 by Snow Brand Milk Products Co.,Ltd (雪印乳業株式会社)