How Can I be sure Of this on Snapchat?

I Sent some Private Pics to some Trusted person on snapchat without thinking much and after he opened the snap I deleted them from chat because it was on (delete after 24 hours) then I got panicked somehow that My Private Pics would be on Snapchat server forever and Might get leaked somehow. I downloaded the data From "My Data" Option and those snaps weren't there, Is that mean those are permanently removed from servers ,Because Other pictures were there …

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