It is over the fence from a known and monitored roadside location - as far as I know it isn't surveyed or monitored within the block but I'm not certain.
This looks like Corunastylis ostrina to me, the lateral sepals aren't as erect and the labellum is quite rectangular. They are both found in and around Mongarlowe.
Thanks Tobias - I've just uploaded another picture of a nearby monitored orchid - have I got that wrong also? I will look up the other one later and compare.