Maybe they purchased what might've called "barn boots" for work in the barnyard. Walmart sells something like that for $14.99. Not that unusual if everybody needed a pair---hey wait, they'd double for messy jobs besides barn yards.Thank you ColMustard I think 4 pairs of identical shoes were purchased for the SOLE PURPOSE
(excuse the pun, "sole" purpose...get it?) of confusing investigators as to the number of individuals involved in the crime. Since investigators always look for shoe prints in order to identify the possible perps, as well as the number of perps involved, it makes sense. Remember Investigation 101: Once is an accident, two is a coincidence and three is a pattern....AND FOUR PAIRS OF IDENTICAL SHOES IS PREMEDITATION ON STEROIDS. (not screaming...just emphasis.) It is also an indication that all 4 of the W's walked (or planned to) on the property in commission of their attack. Can you imagine the shock investigators got when they were able to match up the purchase of 4 identical pairs of shoes to the W family? That had to be an AHA moment that left everyone shaking their heads in disbelief. IMO.
But we don't know whether they purchased barn boots or high heels as far as I know.