Zipp wheels identification help!

These are 650c zipp 404’s. The “zipp” writting is in yellow and underneath “zipp” it says “high performance gear”. What year are these wheels? Are they real zipps?
I’ve never seen stickers like that before. Any and all help is greatly appreciated!!
Sorry I can’t post pics, PM me your email and I will send pics.
Thanks,
Daniel

Check here: http://www.usedzipp.com/
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They could be old rentals. I rented some 808s a couple of years ago and they had the yellow lettering.

glenn

Thank you guys for the info!!