APCH CTLR DID NOT ADVISE AN A300 FLT CREW THAT THE LOC FREQ HAD BEEN CHANGED TO THE OPPOSITE RWY.

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WE WERE ON VECTORS TO INTERCEPT THE LOC FOR RWY 23L AT LCK. BOTH THE CAPT AND I RECEIVED A GOOD IDENT. THE CAPT SAID IT SEEMED AS IF WE WERE GETTING INDIRECT SENSING. I VOICED THIS CONCERN TO APCH CTL. HE SAID HE WOULD GIVE US A VECTOR TO THE RWYS; WHICH HE DID. AFTER HE SWITCHED US OVER TO TWR; I QUESTIONED THE TWR WHETHER RWY 23L OR RWY 5R LOC WAS UP. HE SAID RWY 5R WAS UP AND THAT HE HAD TOLD APCH CTL SO. I TOLD HIM THAT NO ONE SAID ANYTHING TO US. AFTER LNDG; WE AGAIN CHKED THE IDENT -- NOW IT WAS ON RWY 5R (SAME FREQ AS RWY 23L). WHILE TAXIING IN; I QUESTIONED THE TWR IF HE RECENTLY CHANGED APCHS. HE SAID YES; WHEN HE CAME IN ABOUT 10 MINS EARLIER HE HAD CHANGED APCHS TO PREPARE FOR THE EVENING PUSH. NO ONE EXPECTED US BECAUSE WE WERE A LAST MIN EXTRA FLT. WHEN THE TWR CTLR CAME ON DUTY; HE JUST SWITCHED APCHS; BECAUSE NOBODY WAS SCHEDULED IN AT THAT TIME. HE PROBABLY DIDN'T CHK. WE ALL GET LULLED INTO SHORTCUTS BECAUSE OF ROUTINE; AND I THINK THIS IS AN EXAMPLE OF THAT. HAD A FEW OTHER FACTORS BEEN PRESENT; THIS COULD HAVE BEEN A HEADLINE.