If I knew beforehand, definately not.

If it was a cel I already had, then I would try 
to work something out with the person it was 
stolen from. I would probably either return it 
or "rebuy" it depending on how attached the 
parties were to the image.

I remember that less that a year ago I kept a cel 
sent to me from a deputy because I thought it was 
a freebie. I felt so awful when I found out it 
belonged to someone else and returned it right 
away. Any enjoyment I would get from a cel would 
be ruined if I knew it really belonged to someone 
else (collector, dealler or studio).

I've had enough things stolen/defrauded from me 
(my car, cash, watch, professional 
equipment/services, and even a cel payment/cel)
that I would totally understand the anger of the 
victim. Simply saying that the victim should have 
had better security or been more attentive just 
doesn't cut it. A determined thief can steal from 
anyone.