I've run down the source of traffic on an unidentified repeater, at the time, on the same frequency pair used by a local GMRS repeater, with currently 54 confirmed users. It seems to be used by the housekeeping staff at a local mall which is operating a repeater but with a different PL tone. I verified this by catching a member of the mall's security staff talking on their licensed frequency, WQOX482, then talking on the GMRS unidentified repeater a few seconds later to the mall's housekeeping staff about the same topic. The housekeeping repeater never ID's nor does anybody else I've monitored using it.
From what I can find the repeater appears to be operating illegally since 10/12/2015.
The license has long since expired, KAB1523, and was not renewed thus their is no "grandfather" exception to consider.
The following link clearly shows the repeater frequencies used under the "Special Conditions" section of the now expired license.
Our repeater administrator has decided not to make an issue of it since the "illegal business repeater" is seldom used. It's his choice and machine so the following question is just for general information.
Has anybody else run across a known verifiable illegal use of GMRS frequencies, this does NOT include legal use of FRS radios, by a business and what if anything was done about it? Does the FCC really care to get involved?