The expanda foam can be removed with a stanly knife. Can also be trimmed to be flush with the walls. Maybe a layer of steel wool sandwiched between expanda foam? means that it's wedged without being permanant.
Peppermint essential oil is a good mouse repellant. You can place some cotton balls around your steel wool/expanda foam/spak-filled hole just to make aaaabsolutely sure
Just make sure it is the real deal not pretend essential oil....
The smell... most likely a dead rodent/rodent family. If you have mice around, maybe they are in the neighbours too and maybe the neighbours have used poison. The mice might have come to your place to 'expire'.
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