SUP-720 mpls is disabled but using 2048 cef routes

We're using a couple of 7600 with sup-720 as border routers; I've noticed that mpls is using 2048 route entries from its cef table, mpls is unconfigured, no bgp vpn also.

all labels are marked as drop:

brd02#sh mls cef sum Total routes: 817065 IPv4 unicast routes: 747548 IPv4 Multicast routes: 4 MPLS routes: 2048 IPv6 unicast routes: 67465 IPv6 multicast routes: 3 EoM routes: 0 brd02#sh mls cef mpls Codes: + - Push label, - - Pop Label * - Swap Label, E - exp1 Index Local Label Out i/f Label Op 64 524288 drop 65 524289 drop 66 524290 drop 67 524291 drop 

I'v been looking how those entries were generated, and how to free them without luck.

How can I free that mpls routes?, how where added to the cef?