There are a couple of ways to confirm that you installed a maintenance package correctly on the Websphere Commerce instance.
Using the installation log file
To confirm that an installation was successful, look for this message in the WC_installdir \logs\update\ Maintenance_name_.install \updatetrace.txt file:
Listing 1. Example installation log file
(Jun 27, 2011 5:10:01 PM), Install, 27, 2011 5:10:01 PM), Install,
com.ibm.ws.install.ni.ismp.actions.InstallNIFMaintenance, msg1, Updatingcomponent: update.base, percent... [Continue Reading]