The thing to do if you have them, is to put them on with velcro, and if you do get pulled, say you had only come back from a show and havent changed em back, pull the standard ones from the boot, put em on and you should be ok if you dont get a prick of a pig.
andyg_star who used to have a sax on here has a JAP rear plate, he gets away with it all the time apparently: