yea if the buyer knows and understands what happened - the purchase ,and use of the good rods will be on them- with out any bad feelings you know-
have a shop xray them, mag, resize or what ever needs to be done-
youll get some cash back from the bad rod snapping ,
sorry about the bad luck on that rod-
i had a similar problem happen to me on my 3 wheeler- new piston,bore,ect...
not even 1 year of use and kaboom, broke the piston at the wrist pin,broken rod- 3 places, ruined the liner,and broke the cases - (granted your oliver rods were worth more than the trike)-- i still am out
also a ford motor we tore apart ,had a piston let go as well!- there went a new motor--- no not mine but still