If your Mum notices anything missing ie a watch, ring or necklace then definitely ring the police. You can report the incident online as it's not an emergency.
https://www.police.uk/pu/contact-the-police/report-a-crime-incident/
When I worked for Yorkshire Electricity, the meter readers would get an extra £15 for every meter tamper they found. They search for pin pricks in the cables, and signs of nuts being 'wrenched' especially.
Gas meter readers are not Corgi qualified to inspect appliances.
@birthofanorange...