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Since the fish are showing no signs of ich for the past 3-4 weeks, and if they don't show any signs in the few weeks to come, I see no reason to treat for something they do not have.
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I would be worried that they may still be carrying the parasites but in some undetected location, possibly hidden within the the gills. This is a quote from the article in Reefkeeping.
"It is possible that immunity could protect the fish from massive infestation, but still allow small numbers of parasites to remain and reproduce undetected by the aquarist. This is where the 'Ich is always present' argument comes into play..."
I would probably take the extra precaution and treat the fish anyway just to ensure that the 6 week fallow period has every chance of being successful.