My mountain bike friends have said something similar. One of them suggested that one day the missus will casually reel off the exact specs of one of my bikes making it abundantly clear she knows exactly what I've been buying
Her stash of clothing I haven't got a scooby doo about it. Stuff comes into the house, most of it looks exactly the same as the rest of her stuff, and she claims it all gets returned - yet the bedroom and attic resembles a jumble sale.
Her memory is certainly formidable. I was struggling to find a remote for some piece of equipment I hadn't used in a decade - showed her a picture of it online and she pointed out the box it was in within a minute.