UL specifically addresses lighting retrofit kits and what UL Classified means in that case. In a nutshell, it means the kits have been evaluated as to their suitability for retrofitting into a previously LISTED fixture. The purpose behind this was to avoid having people buy cheap unlisted fixtures, or make their own, then use these kits to get around the listing process. So they can ONLY be used as retrofit kits, hence they are classified, not listed. If it said "Listed", it would have to include all of the other parts of the fixture, because that is part of the fixture listing process. It's similar to the UR "Recognized Component" issue in that it must be part of someting else to be used, but unlike the UR labeling, it can be done in the field. So the UL Classified issue is fine, in fact it is required.
http://ul.com/wp-content/uploads/2014/04/ul_LumenaireRetrofits.pdf
That however does not preclude the possibility of a counterfeit mark. You can go onto UL.com to verify the file number however, and if they dont show or will not provide their file number and the exact name of the company it is listed under and how that relates to the company name on the product if not the same (another problem with Chinese counterfeiters), I'd be very very suspicious.