While there isn't a single official blog post with that exact file name as a title, "Glitterbox 2023.part1.rar" typically refers to community-shared archives of live DJ sets from the residency at Hï Ibiza or their various festival stages (like Tomorrowland or Defected Croatia).
: For specific identification of songs from the "Part 1" archives, 1001Tracklists is the most reliable database for Glitterbox sets. Glitterbox 2023.part1.rar
If you are searching for the content likely contained in a ".rar" file from that year, you can find high-quality official streams and tracklists here: While there isn't a single official blog post