This came up somewhere else a day or two ago - 1033 is a pack of instructions (DACTA Activity Cards). These were sold separately from set 1032 (a 4.5 motor kit) because educators (whom these were produced for) could give each kid a different card, (...) (25 years ago, 9-Aug-99, to lugnet.market.buy-sell-trade)
(...) I have information to contradict this previous message. I have an unopened 1032 set that has set 1033 inside the box. When this set was bought in 1988 set 1033 was included with set 1032. I agree that additional sets were sold separately like (...) (24 years ago, 30-Mar-01, to lugnet.market.buy-sell-trade)