I'm going to preface this by saying I used to both work in and later run a computer repair shop (currently still work with computers but focus more on business IT so I don't see much personal stuff these days).
Something I found kinda weird about the NYPost story and Rudy Giuliani's message today was that the computer repair shop turned the laptop over to the FBI. Having worked in that exact industry, we don't just turn laptops over to the FBI because there's some raunchy photos on it. Drugs? If it's turned over at all it'd be to the local police and they take it from there. Prostitution? Same thing. Just about everything else is "none of our business" and we don't "see" anything.
There is, however, one case where we are, in fact, required by law to report and turn over a computer/hard drive/device to the FBI (if we didn't we could get in big trouble): Child Porn.
Now I'm not going to pretend I know what's all on that laptop. Hell, I'm still not quite 100% sure it's even real (although the photos we've seen today make a pretty strong case). But the fact it was turned over to the FBI, and then we see Giuliani state there are illegal things on it, definitely makes you wonder if we're just seeing the tip of the iceberg here.
Possible, but also trump was being impeached for talking ABOUT HUNTER BIDEN'S CONNECTION WITH BURISMA.... Soooooo yeah the dude might have called the FBI. kind of different situation than what described. Unless in your work in computer repair you happened to find information pertinent to the impeachment of a sitting POTUS....?
I won't claim to know how every CRS operates. In my experience, we don't tend to look at things like Word docs or PDFs or Excel sheets, no matter who it comes from, unless specifically asked to. Images/videos however are a bit different as they tend to have thumbnails that you can't always unsee.
Unless the shop was snooping through the contents of the disk, I'd have a hard time believing they just stumbled across incriminating documents worthy of reporting to the FBI.
The shop might snoop through the contents of their hard drive after the 90 day wait though, no?