Comicconxion is correct - these 2nd prints of 3, 4, & 5 are not marked 2nd print anywhere and match issue 11 when it comes to ads and back cover.
Example:
These are #3 1st prints with this back cover ad
These is the #3 2nd print that matches #11 ads and back cover:
Here's issue #11
Any 3, 4, or 5 with an M price box with the Jedi Arena Ad is a 2nd print (the back of 4 1st print has a Star Wars: Empire Strikes Back Video game ad and #5 1st print has a lego ad.)
MANY 3, 4, & 5 (2nd prints) have been graded by CGC as 1st prints because they are not clearly marked as such... all triangle price boxes (issue 1, 2, & 3) are 1st prints.