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by goatforce5 4723 days ago
The article is really unclear, but to me it sounds like they were doing reverse phone lookups.

Illegal advertising - get the details of the number on the poster.

Unregistered pets - maybe they have an 'if found please call ...' tag on the pet, but no pet registration.

People dumping stuff illegally - if you were dumping general household/office waste, you'd probably have letters or bills with your address on it already, but I can think of scenarios where they might only have your email address to go on.