Just walking through a patch collects plenty of spores that you will spread anywhere you go in those same shoes/clothes. Alot of public places (can't name them but have a good think) and gardens are innoculated this way without the shroomer even knowing. I'm guilty of throwing them in every wood chipped garden bed i see and last year this payed off when i was able to eat caps from a garden on the way home from a crap night at the pub, added another 4 hours onto my walk home though hahaha
As i have said before, if you cant find heaps in mid season your in the wrong place or your patch has been raped. Most of my patches were too dry last year but a short walk into wetter bush revealed thousands.