Yeah, you're probably right.
I guess it depends on how sales actually went for the game in question. In this case - open it up. For any Man Utd returns - keep it at Tier 2 as there will be people there who missed out but wanted to go.
Unless the club communicate about the availability, most fans won’t know. As far as most are concerned, West Ham sold out long ago and very few people have any need to be on the ticketing site currently.
I think it’s right that the club give the tier where the initial “sell out” happened to...