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Gilbert Maines1933-1938 exhibit 4 in 1s are blank backed.
Which is as important a piece of information as a partial football score, such as Detroit 17.
Edited to add:
Being a bit of a thickhead, I did not see why only three exhibit cards should have images similar to w517 minis, I thought lots of others could exist. So, I checked the images maintained on the card pricer site. They had plenty, but by no stretch all of the exhibit cards available for viewing. I saw no images in the 1929 or 1931 sets which appeared applicable to the minis. The next available set of card images which they had was the 1935 exhibits. I similarly noted no images in any card position which appeared similar to what I know of the mini series.
But please recognize that this information is not believed to be reliable, in part because I am not familiar with many of the w517 mini images used. I do note that some, but not all differ from the standard w517s. Plus I do not even have a checklist for the minis. However, in the 1935 exhibits a different Gehrig picture is used than in the earlier sets.