Scam? Very likely.
I have heard of widows who were approached persons making such claims. The potential scammers were unsolicited - meaning the scammer initiated the contact. They scammer is very convincing. If you are approached, DO NOT grant them access to your attic. Instead, contact a reputable pest control company (which you can find by using this forum) and have it checked out.
In my opinion, our houses are generally well-protected against rodents, unless you let trees grow to touch your property.
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