We marked a phone stolen and had a text from “apple” to say it’s been located but asking for log on info

Hello Julee,

Apple only offers the Find My features: Use the Find My app to locate a missing device or item - Apple Support

as help recovering lost or stolen items. As you can see from the document, Apple itself does not actively do anything and certainly won't send you such a message. As was observed in a previous post it appears that that message isn't even originating from an apple.com site. What you are seeing is a phishing message. Here's some documents about those:

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

Apple 'How to identify, avoid, and report phishing' video--> https://youtu.be/SR3Z3fXXjfw

Apple sends no such messages. And, as you can see, you're not on an apple.com website. Someone is trying to get your credentials