On used market, there is a discrepancy for "public" and "on auction" aircraft.
E.g. Boeing 737-BGW, fornebu. It says "public" 126, but "on auction" only 55 (including both public and private auction).
There are some aircraft where public = on auction. And some not.
I can understand where "on auction" > "public" (meaning privately owned aircraft is on auction). But I cannot gasp why would there be a situation where "on auction" < "public".
Is there any explanation for this, or am I missing something?