It would seem your choices are to either find someone with expertise in flasking temperate terrestrials (and as Philip says, skill sowing tropical epiphytic orchids often doesn't translate), or sow them on soil incorporating the humus you were sent. I don't want to seem discouraging, but the odds of success of the latter, in my opinion, are really low. But doing nothing ensures zero success, so if you can't find someone to flask them for you, why not? The third option would be to freeze them - a friend has a method by which he routinely freezes fresh seed (mostly of tropical epiphytic species, I've no idea if these would survive) for several years at a time - but that's just deferring the decision. Good luck, whatever you decide.
Steve
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