Datejust Year Model

[Chamix]

Hi guys,

I'm doing some research about this Datejust I'm interested in buying. I'm confused about the model number and apparent year. It's a 16220 and the dealer says it's from 2006. They have what it looks like its the original sales receipt which says it was sold in 2006. I've looked up that model number and apparently its supposed to be from the mid 80s to the mid 90s or so.
I wonder if the watch was sold in 2006 as a certified pre-owned since it has a red seal tag. Not sure it that was a thing back then.

Unfortunately I can't seem to upload pictures/links until my 10th post.

I appreciate any thoughts and ideas.

Thanks!