Did you use net_applet or networkmanager, and what Mageia version on source and destination?
For the the default net_applet, they are located in /etc/wpa_supplicant.conf at the bottom.
For the latter, it depends on what desktop environment you used on the old laptop. If the old laptop is still working, fire it up and run seahorse,
which is the GNOME keyring, they should be stored in there, although I've no clue if it supports exporting them. Have a look at
http://lukeplant.me.uk/blog/posts/expor ... ahorse%29/Under KDE, they should be stored either in plaintext form in files under ~/.kde4/share/apps/networkmanagement/secrets/ or if you choose to store them in encrypted form they are stored in kwallet which can be accessed via kwalletmanager which can also export and import the keystore.