The (rare) pluperfect refers to an act completed in past or present time or to the state following on such completion.
εἰ ταῦτα ἐπεποιήκης, καλῶς ἂν ἐπεποιήκης
The implied opposite is a perfect (ἀλλ' ου' πεποίηκας
a. The pluperfect is used only when stress is laid on the completion of the act or on the continuance of the result of the act, and generally refers to present time. In reference to past time, the aorist is generally used instead of the pluperfect.
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].