Suggestions:
Firstly, given the festive season is upon us, a warning seems in order.
If you are having trouble finding psilocybin containing mushrooms, could it be because this is to be your first encounter with them? If so then please read extensively about the subject if you haven't already. There are some great Bluelight threads on this forum and in others such as trip reports.
Mushee Neebees, please remember the potential with Magic Mushrooms. Learn and know how to identify similar and dangerous species' in your area, and if you do locate what you're after, apply the more is less rule until you have established how strong they are and how well you tolerate the more uncomfortable parts of the trip. Compared to MDMA, there are many IMHO, although I don't want to infer either is necessarily a better drug than the other.
That being said, now some more practical tips.
Dress appropriately and drive a respectable car. A couple looks better than a car full of anxious guys.
Look for a north east facing, short grassed, gentle slope with grazing cows. Unless situated in an obviously private and little used access, approach the nearest farm house and ask the farmer if he knows anywhere you might find mushrooms (normal, don't mention magic!!). Most farmers who have goldtops (Queensland/NSW) know about them, and will warn you, usually with few anecdotes to go with it. NEVER admit knowing anything about them, other than perhaps the odd media story etc. The good farmer may then even point you to the best paddocks. But you'll know that where there are cows, optimum conditions for fungi growth are just that. Where there's one, there's often the other...
Apart from perhaps this pinch of initial dishonesty, be respectful in every other way. Pick some normal mushrooms if possible, and go back and say thanks, showing him the regulars you found. Ask him if it's alright to come back if the weather is better (he may do stock rotations and tell you to ask first). Don't go sneaking back at the crack of dawn, or desperately search at night with a torch or headlights. Most of all,
don't tell your mates where your location is. Do it right, and no harm should come to anyone.