Art. 2113. At the public auction, the pledgor or owner may bid.  He  shall,  moreover,  have  a  better  right  if  he  should offer the same terms as the highest bidder.
 
The pledgee may also bid, but his offer shall not be valid if he is the only bidder. (n)
 

RIGHT OF PLEDGOR AND PLEDGEE TO BID AT PUBLIC SALE

     To  avoid  fraud,  the  pledgee  is  not  allowed  to  acquire  the thing pledged if he is the only bidder