Thanks to Don for this link and information!
codex Vaticanus Graecus 1950 (1950 is the reference number, not a date incidentally)
The Vatican Sayings begin at the bottom of folio 401v with the big red Τ for Το μακαριον και αφθσρτον ... (PD1)
See further information in Bailey's "Epicurus the Extant Remains." Bailey discusses the Vatican Sayings starting on pp. 106 & 375. He gives all the sources or at least where they're also started in latter section. The following is the main section of page 375 - https://archive.org/details/Ep…/page/n373/mode/1up?view=