If I'm not mistaken, all the fleet scenes after Favor The Bold were CGI. So it would have to have appeared in the first 5 episodes of season 6.
The only scenes it could have appeared in were the ones at the beginning of A Time to Stand and a few establishing shots of Starbase 375.
The first one has been studied pretty extensively and it's almost certainly not there. The shots around 375 are a fair bit clearer, and the ships there are recognizable classes.
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