Bruce, good to know, thank you. I just recently cleaned out my wallet and tossed it.
It is very simple to print a new one. On the website, under the link My Account - Print My Membership Card - Click here to print your card. I assume an image on your phone would be acceptable also.
Purchasing an item at Trek store yesterday, they informed me that they will be checking WAB membership cards from this point on if you request the WAB discount. Historically, both Trek and Conte's have just taken my word that I am a WAB member but they are cracking down in the future.