A SEGA Dreamcast VMU has been posted on reddit that is from E3 1999, it appears to be a specially made VMU or contain a save file that displays "SEGA E3 1999 Spring" on the VMU's home screen??? I thought I would float it over here for any experts to decipher.
https://www.reddit.com/r/dreamcast/comments/vq2niu/e3_memory_card_anyone_ever_see_one_of_these/?%24deep_link=true&correlation_id=18c69665-1933-4599-b7fc-08e4757008f0&post_fullname=t3_vq2niu&post_index=1&ref=email_digest&ref_campaign=email_digest&ref_source=email&utm_content=post_image&%243p=e_as&_branch_match_id=1058088492499665917&utm_medium=Email%20Amazon%20SES&_branch_referrer=H4sIAAAAAAAAA22Q3WrDMAyFnya7S5vGaZoMyhiMvYbwbCUx9d9ku13ffjJd7wY2HH0H6cjeco7pdb8n1NrknYxxZ42%2F7EV8a%2FpBxDOCTC8sA5nVeGmhkD1vtasR703%2Fyed2u%2B3%2B%2BlVwDIivJpROyZRZM3Xoc2J5%2Fe69KSxQgEMX6A5Kkgbp78Ej4BUJEiLUIiyQN0xYUwQHDRoxQl2vER%2BZChujCkRoZTbBg9HMD5Ma53E8todZiHY4znP7dVpU2004nI6nrpuWjvtiSBmWYq2XDus4Ac%2FVHp7xGn%2FqPAaECyt00ljQZsX6qAp5dRelWf3%2FbgqFFD49hiU7UMFn%2FgumjxgnV%2FwFUV5SmoUBAAA%3D