Your problem has been identified, and a number of other issues have been pointed out. This one hasn't been mentioned, but caught my eye: 

unless ($found == undef) { ...

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That's not doing what you probably think it is. undef in a numeric context like that is 0. So, if $found is... wait, where is $found being set? Actually, I have no idea what is happening there.

The point was that you should test definedness with defined():

if ( defined( $found )) {...}

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Thanks to a series of coersions, your code is functionally equivalent to: 

if ( $found ) { ... }

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In reply to Re: Confused about 'Name "main::whenfound" used only once:' by fishbot_v2
in thread Confused about 'Name "main::whenfound" used only once:' by Maze

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