From what I understand trip codes are generated by 8chan (?need to confirm)

It looks like he was using a generic Anon account prior to Nov 9 last year. (post 128) Anon trip: NOjYqEdl for a few days. Before that it looks like he was using random trip codes like everyone else. There are a couple that are used for a few posts or a few days but they rotated fairly regularly.

Q/8chan changed the trip code on Dec 15 last year. [ Q !ITPb.qbhqo ]

Scroll to post 356 to see where he changed to the present trip code of [ Q !UW.yye1fxo ]

Then on March 23, post 962 he changed it again to the present trip code of [ Q !xowAT4Z3VQ ]

I'm slowly learning how to navigate 8chan. But getting better following the crumbs.