I think it's pretty safe to assume that if you didn't get your membership cards, you probably missed (or dismissed) the mailer they were sent in. If you got the 25th Anniversary silver envelope, your membership card should have been in there. At least, for one of your members. We never did get my wife's card, but mine was in that mailer. It would be easy for someone to miss, and several people here said they did indeed miss it until someone pointed it out.
Call Member Services and see if you can have a new one sent?