I just looked on The Numbers, and it clearly reported box office back on the week of Nov 14 when it had a one-week Oscar run, where Arco and Sirat each just reported three-day box office from that three-day Neon initiative with Secret Agent, Sentimental Value, It Was Just an Accident, etc.
Arco ended up getting a limited release in its 12th weekend and reported that box office as it delisted, but Sirat delisted before it got a real theatrical release... in its 13th weekend.... just like Kokuho
https://www.the-numbers.com/movie/Sirat-(2025-Spain)#tab=box-office
This seems to be a fairly new thing because in the past, movies wouldn't report their one-week box office but newer distributors like Neon are doing things different. there's nothing that can be done about Sirat/Arco now, but maybe in the future, when there's a one week (or in those cases, 3 day) box office reported for an Oscar run but then they're out of theaters until Jan, Feb, March, etc. they stay on the exchange and start their limited runs when they're actually released.
I feel like there are other examples this year like Dead Man's Wire, which definitely got a one-week run in 2025 but didn't report...but if things are reporting but Antibody misses it (like Kokuho) they'll get a full run on HSX?
IMO KOKUH should have delisted at the same time as SIRAT or neither should have delisted. This is definitely a new thing.