If you're looking for something you've lost, you can search here. The Lost and Found Centre, located in the Main Terminal Building, keeps all lost items for 30 days before disposing of them.
Lost & Found
BAGGAGE SERVICES OFFICE (KLAS)
KLIA Lost & Found (for items lost in the KLIA terminal)
+60 (3) 8776 4312
Location: Level 2, Main Terminal Building, KLIA (next to Daily Pass counter - Airport Security Pass)
Operating 24 hours. During public holidays and weekends, you may also call:
+60 (3) 8776 2000
SINGAPORE AIRLINES LOST AND FOUND CENTRE (for items lost in SQ aircraft)
Malaysia Airlines Lost & Found Office (for items lost in MH aircraft)
klia2 Lost and Found (for items lost in the klia2 terminal)
Location: Level 3, Departure Hall (near check-in counter Z), klia2
+60 (3) 8778 5409
(Monday - Friday 0900hrs-1700hrs, except Friday break from 1215hrs-1445hrs)
+60 (3) 8778 5000 (After operating hours)