There are 3 different sets of these Code Cards listed depending on which set they were released in.
https://www.tcdb.com/Checklist.cfm/sid/10391/2010-Topps---Attax-Code-Cards 2010 Topps Base set Series 2
https://www.tcdb.com/Checklist.cfm/sid/199191 Topps Attax Base set
https://www.tcdb.com/Checklist.cfm/sid/10601 Topps Update
The Release Notes of the last two sets give the Code# last 4 digits (or more) to distinguish them from the others - Good Stuff! The first set does not have this info in its Release Notes but by exploring the other two sets, I found the info on its Code# in the 2010 Topps Attax Base set Release Notes, "Cards from this set feature the number 00004089 or 0004088 on the back. Series 2 Cards have the number 36210156 on the back." Nice but as it is written, it does not clearly lead me to the 2010 Topps Base set issue; it actually makes me believe that the Topps Attax set was released in two different series.
If others agree, can we make things clearer? Or at least include in the Release Notes of the 2010 Topps Base set that Topps Attax Code cards inserts have the code # ending in 0156?
Bruno
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Check my Profile page to see my 2023 Goals and my Lists of sets near completion (5 cards or less) or sets getting close (less than 100 cards missing and 75% complete).
https://www.tcdb.com/Forum.cfm/Page/B/ID/0/?MODE=VIEW&ThreadID=25745&C=0