K9,
Mine looked the same way when I changed it in late summer @53K. I have printout from Lexus that shows my vehicle was serviced @ 15,30, & 45K before I got the car. EVERY ONE of these services includes a NEW CABIN FILTER - but I guess the DEALER <_< JUST HAPPENED TO FORGET and propably charged the previous owner with it anyway <_<
THIS IS EXACTLY WHY I DIY . If I do take it to shop, I check EVERYTHING out myself and leave CLUES so I KNOW IF IT WAS DONE OR NOT......
I printed out prices from IRONTOAD.. I think the filter was $35 online. Showed the price to Lexus Dealer, and parts guy (although not always) matched the price. Lexus retail is $55.00