According to perldoc Net::LDAP::Entry:

       get_value ( ATTR [, OPTIONS ] )
           Get the values for the attribute ATTR. In a list con-
           text returns all values for the given attribute, or
           the empty list if the attribute does not exist. In a
           scalar context returns the first value for the
           attribute or undef if the attribute does not exist.
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You're calling get_value in a scalar context! Stop that.

You're also calling printf with a variable number of arguments. That won't work very well until you change the format string.

-- Randal L. Schwartz, Perl hacker