Well, I see I jumped to an incorrect conclusion. Ken just sent me a summary of the Lefevers still for sale. I assumed Bob's list was guns sold, not hammer price on which some were not accepted.
#3481 Super G 2 barrel Est 20 - 30k
#3483 CE Est 12.5 - 22.5k
#3485 CE 20 Mono block Est 7.5 - 12.5k
#3487 EE Ithaca assembled Est 4 - 7k
#3488 EE SO Est 1.5 - 2.5k
#3489 Early E Est 0.5 - 1k
#3490 G Est 0.6 - 1k
#3494 DM 5B Est 15 - 25k
This makes it look as if there was a minimum required bid of more than 90% of the low estimate on these guns.