You can sanitize them whenever you want, cover the mouths with cellophane. Once they're sanitized and there's no way for contaminants to get in, you're golden. You'll be fine.
FWIW; Commercial breweries don't sanitize bottle caps as a rule.. new glass either (SOME will have a no rinse sanitizer in a twist rinser, but that's about it). Wooden bungs, when they are used in Hoff Stevens and Golden Gate kegs aren't sanitized either.
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"Why did you.... what was the point of... how drunk were you when you decided this was a good idea?" - DMartin
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