The ones I’m thinking of grow on the rot inside birch trees and are hard, not slimy, and very slow growing so You’re only supposed to sustainably take every 3rd one you come across. And if they’re on a different tree, not birch, that’s when the issues arise with toxicity. I am picturing it right now I just can’t think of the name.
Based on this interaction alone and his dad deciding the price for him, I’m going to make the wildly assumptious assumption this is a 20s/30s(/40s?) unemploymed guy living at his dad’s house rent free.
If my assumptions are incorrect, sorry mate, you did not win the dad lottery.