It doesn't look like your plants got cooked by the heat, although the heat probably didn't do much good. If the plant got cooked, the leaves would turn white, then black & would have fallen off by now. The 2 leaves with the dark marks have experienced some cell collapse & over time they might turn black.
It's not surprising that the buds fell off. In preparing for shipping to the US, foreign vendors need to remove all media from roots (with some exceptions for some phal & dendrobium types). To meet the show schedule, plants were probably stripped at least 1-1/2 weeks ago, cleaned, dried, packed in boxes, shipped as freight or accompanying luggage. Upon arrival in the US, the plants needed to be unpacked & inspected before being released.
Then the vendors had to sort & repack the plants for mailing to customers such as yourself. The US mail takes a few days, at least. Depending on the media in which the plants were grown, stripping the plants could do lots of damage to the roots. In any case, the plants have been without water for a while. The heat can cause some desiccation also. It's expected that the buds would fall off. But the plant should be ok, even if it should lose the 2 leaves. In the middle photo, the undersides of a couple other leaves show a little stress & cell collapse … but not as bad yet. Your plant just needs to heal & grow new roots.
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