I wrapped fish in aluminum foil and baked it at 450CSome water dripped thru the foil and burnt in the oven, which is giving a smell.
If it's burnt then for sure there will be a bad smell.
Set 3 or 4 traps in random places interior the atticUse a dab of peanut butter for baitexamine on a daily basis and reset if mandatoryAfter 4 or 5 days of no new journeys it is going to likely be risk-free to seal any openings.