The fuzz turned a different color. Betcha. I know of no mushroom that has such a pure white color that will only change if it is potent and bruised, then there will be a blue, and in very rare instances a green tint.
I'll say it again, mushrooms shoot (yes, they actually fire) spores in the millions. There is another thread here where a guy saw caps with a purple brown dusting on the top. If a single Spore is microscopic, really really small, how many do you figure it would take for someone to actually see their color?
If every spore from just s few caps were to germinate everything would be mycelium.
We could calculate the odds that a Spore will light on a good place and adjacent to a sexually appropriate second Spore (they are sexed) and it would be a tiny tiny number.
There are ways to grow morels. You make a slurry, a rather thick mixture of morels, or spores in water and then just pour it everywhere in your yard. You might. Might, get morels next year. Might. That is how hard it is to skew the odds in your favor unless you eliminate every competitor and introduce perfect conditions.
. Anyway that led me to wonder if I could remove a section of the ground from the area I found them in and transplant it to an area in my yard. I wasn't sure if it was worth bothering to try or not.