Find out if the buyer fed it right after the boa regurged in the box, because if that's the case, then it will continue to regurge until you give it enough time to build back the bile in its stomache to digest the food. The boa should be left alone and not fed for atleast 14 days or even more, if it has regurged muliple times, i would leave it alone for 3 weeks. What i've done in the past is administer orally some pedialite through an oral syringe to help rehydrate the animal. When the first meal is given after this, make sure it is a very small mouse, like pinky. Then feed every 10 days gradually increasing the size of the prey.
This is a very long process and the buyer should not get discouraged, there is still hope if they do their part.
Good luck.

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