See bulletin as below. We have to put a green mark on the engines over here as below.
If its been done properly it should be fine, but run it for a while a check the crank case split for leaks with a torch. Pretty hard to say if they did it right or not. Wonder why they said it had been done and then not logged it with Merc net, if they didn't do that they would not have been paid by Merc to do the job. Maybe that's why the went bust!! Or maybe they didn't do it at all, if on inspection you can see a leak then you don't need to fix it.
Mercury Marine has received isolated complaints of engine oil leaks on the outboards listed above due to improper torque of
the crankcase bolts. Mercury Marine has determined that the torque applied to these fasteners during production may not be
sufficient to retain the proper torque under all operating conditions. Engines with insufficient crankcase bolt torque could exhibit
an engine oil leak at the crankcase split line seal.
Outboards reworked by the factory or by an authorized dealer will have a mark indicating that they have been reworked. If the
outboard is still in its shipping carton and has been reworked, there will be a green sticker on the boxing matte in the area of the
model identification. If the engine is out of the shipping container, it will be identified by a green mark above the oil fill cap.