Have you tried returning them to NAPA, if they don't look used and you still have the boxes with teh reciept, they should take them back. Otherwise when you list them here or wherever, post a pic of the reciept date and warranty with them, it will help you get a better price than $40. If you have the reciept and warranty I thing you should be able to get $175-200 for them, you may have to sit on them for a while though, oem ignitors and coils don't seem to fail that often.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed