Suggest you wait at least a few weeks or even a few months after everything is done before the final sign off. I remember looking at a lake cottage 15 years ago over on Paugus bay that had an oil tank rust through into a dirt crawl space. Supposedly it was fully remediated but it still stunk like fuel oil in and under the cottage. I would not sign off until you are sure that the oil didn't seep into the soil under the slab. The smell will never go away. I would tell the insurance you will not sign off until there has been no oil smell for at least a month. Have a friend come in after a month, because you will get used to the smell. That was a really bad screw up by the technician, it's important to check your burner after they are done and a couple times in the days after having service done. This has happened to me before also, fortunately I caught it before any damage and have been checking after service ever since.
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