It needs to be postmarked by April 15, so you have a little time to let USPS open the case tomorrow and then decide if it's worth sending a second copy. People often suggest sending via certified mail, but it seems to slow things down and isn't usually needed for most tax returns. Regular first-class mail is less problematic when there is not a pending legal issue that requires a very time-sensitive response.
I wouldn't mail an extra copy in unless USPS tells you that the package is irretrievable/lost.
I suggest that while you wait to sort this out that you mail an extension, regular first class mail. This will provide you with additional time to find the delayed original.
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