As you stated later in the season they inserted Traded cards. A typical Topps marketing strategy to add an insert set. Most boxes did not contain traded cards.
By the way this is a 1982 Topps Factory set and it did not include the traded cards. Now you could argue that there were no traded cards in packs but in 1985 traded cards were issued in wax and as a box set but the Factory sets only included the base set again no traded.
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