How do I reply to someone who finds my stuff?

You can’t reply directly unless the Finder entered some contact details in the message, which you’ll have in an email.

We will reply on your behalf if you click the Reply link in your Finder report email or text.  This opens a page where you can enter a message, and we’ll send it by email to the sender without revealing your details to them, or theirs to you.  This is done for your (and their) safety and privacy.

We all lose stuff. I usually get mine back!