A member in Northern California
successfully germinated Spathoglottis plicata seeds in an unsterile jar. This method probably has a success rate somewhere between natural sowing and flasking. With natural sowing a large percentage of seeds won't land anywhere suitable. Those that do might not get adequate rain/water to germinate. If they do germinate, then quite a few seedlings will be eaten by the usual suspects. Sowing the seeds in containers should have a higher success rate... but not nearly as high as it would be for flasking.
I sow quite a few reed-stem Epi seeds in pots in zip lock bags and have
decent results. Some batches do better than other batches though so I usually hedge my bets by including a couple non-orchid seeds in each pot (ie Gesneriads). That way I usually get something for my time and space.