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Overall view of the three aft skirts.

As can be seen, all three aft skirts are missing panels, and based on the aerial view, it appears that none of the three aft skirts were particularly complete. My initial though was that they scavenged parts from all three to make a single aft skirt for display on their SRB, but a bit of research upon returning home showed that they shipped in a complete aft skirt for the SRB display.

For additional information on the Shuttle SRBs, see the Kennedy Space Center's Solid Rocket Boosters page in their NSTS News Reference or this SRB exploded view diagram.