A table of all the missing access points:
1.3.6.1.4.1.2356.11.1.73.9.1
lcsStatusWlanMngmtApStatusMissingApTable
The reason for only the missing access points table is because I have seen people have 500+ access points hooked up to a single WLC.
The count of expected access points:
1.3.6.1.4.1.2356.11.1.73.5
lcsStatusWlanMngmtExpectedAp
The count of connected expected access points:
1.3.6.1.4.1.2356.11.1.73.6
lcsStatusWlanMngmtConnectedExpectedAp