Instead of having "$i.found" or "$i.lost", why not just make the array value true or false and index it by $i. The 0th element will be useless, but don't worry about it:

my @array;
foreach my $i (1 .. $SOME_BIG_NUMBER) {
    $array[$i] = 1 if found($i);
}
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I wanted to explore how Perl's closures can be manipulated, and ended up creating an object system by accident.
-- Schemer

Note: All code is untested, unless otherwise stated