Good question, I purchased the Gucci Supreme Patch Tote and Gucci Supreme Patch Portfolio from Gucci Fifth Avenue, NYC and there was the same warning, I noticed it from the website the day before I went to purchase in the city. The warning was for California residents... I'm in New Jersey and totally ignored it because I was so enamored over the item(s) and I am not in California. So you do raise a great question... I think I will call Gucci on Monday to ask... unless one of our wonderful TPF-ers can answer this question before then.
"J!m"