Don't use mushroom ID apps and don't trust random guidebooks from Amazon, they're probably AI-generated crap.
The deadly mycotoxin orellanine, which is present in Cortinarius rubellus, the deadly webcap, may not cause symptoms in those who ingested the mushroom until one or two weeks have passed – after detectable traces of the toxin are already gone, and late-stage kidney failure has already begun. Connecting the sickness with certainty to a misidentified wild mushroom that was eaten weeks earlier with no obvious ill effects is not always possible.