This is an excellent tip. I get a high degree of transplanting success in when I transplant moss in conditions where I found it. So - if is found under the dappled shade of a tree - unlikely to survive on bonsai that requires full sun. If found in a gutter - look at when and where the sun hits it and try to replicate. I also not that I had grabbed moss from roadsides on the Mornington Peninsula - very sandy, tight stuff growing in nearly full sun...that transplants well into full sun areas where I live but... you must keep the sand base... it dies when the sand base is removed... in my experience.
In short - if you can replace the conditions it is found in .... it has a higher likelihood of survival... in my experience.