Igor,
This is a risky exercise at this time of the year.
Through the courrier/post handling and storing maneuvers it would be not much difficult to have the pack subject to excessive heat and this could well cook the living creatures inside their galls.
if this was the case, then, within a matter of hours the synconium would dry, shrink, turn yellowish and fall off. - see the symbiotic relationship between the insect and the synconium-
but the tree will be kept living and growing.
another possibility could well be the typical rough handling by the Post operators, forcing the fruit to separate from the limbs
or checks using some dose of radiation lethal to the insects
It would be interesting to see pictures..
Francisco
Portugal